RAMBUS INC
S-8, 1999-12-22
SEMICONDUCTORS & RELATED DEVICES
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<PAGE>

    As filed with the Securities and Exchange Commission on December 22, 1999
                                                    Registration No. 333 -

================================================================================

                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549

                              --------------------

                                    FORM S-8

                             REGISTRATION STATEMENT
                                      Under
                           THE SECURITIES ACT OF 1933

                              --------------------

                                   RAMBUS INC.
             (Exact name of Registrant as specified in its charter)



             Delaware                               94-3112828
     ------------------------          ------------------------------------
     (State of incorporation)          (I.R.S. Employer Identification No.)

                               2465 Latham Street
                         Mountain View, California 94040
          (Address, including zip code, of Principal Executive Offices)

                              --------------------

                                 1997 Stock Plan
                        1997 Employee Stock Purchase Plan
                       1999 Nonstatutory Stock Option Plan
                            (Full title of the plans)

                              --------------------

                                 Gary G. Harmon
               Sr. Vice President, Finance and Chief Financial
                                    Officer
                                   Rambus Inc.
                               2465 Latham Street
                         Mountain View, California 94040
                                 (650) 944-8000
(Name, address, and telephone number, including area code, of agent for service)

                              --------------------

                                    Copy to:


                              Gail C. Husick, Esq.
                        Wilson Sonsini Goodrich & Rosati
                            Professional Corporation
                               650 Page Mill Road
                        Palo Alto, California 94304-1050
                                 (650) 493-9300


<TABLE>
<CAPTION>

CALCULATION OF REGISTRATION FEE
- -----------------------------------------------------------------------------------------------------------------------
                                               Amount      Proposed Maximum      Proposed Maximum
          Title of Securities                  to be        Offering Price      Aggregate Offering      Amount of
            to be Registered               Registered (1)      Per Share               Price         Registration Fee
- -----------------------------------------------------------------------------------------------------------------------
<S>                                        <C>             <C>                  <C>                  <C>
Common Stock, $0.001 par value:
- -----------------------------------------------------------------------------------------------------------------------
- -- Newly Reserved under
   1997 Stock Plan, as amended on
   October 20, 1999 (the "1997 Plan")
   (2)................................         941,662           $70.25 (3)       $ 66,151,755.50            $18,390
- -----------------------------------------------------------------------------------------------------------------------
- -- Newly Reserved under
   1997 Employee Stock
   Purchase Plan (the "ESPP") (4).....         187,178           $59.71 (5)       $ 11,176,866.33            $ 3,107
- -----------------------------------------------------------------------------------------------------------------------
- -- Newly Reserved under
   1999 Nonstatutory Stock Option Plan
   (the "1999 Plan")..................       1,000,000           $70.25 (3)       $ 70,250,000.00            $19,530
- -----------------------------------------------------------------------------------------------------------------------
Total                                        2,128,840                           $ 147,578,621.83            $38,970
- -----------------------------------------------------------------------------------------------------------------------
</TABLE>

(1)  Pursuant to Rule 416(a), this Registration Statement shall also cover any
     additional shares of the Registrant's Common Stock (the "Shares") which may
     become issuable under the 1997 Plan, the ESPP and the 1999 Plan
     (collectively, the "Plans") being registered pursuant to this Registration
     Statement by reason of any stock dividend, stock split, recapitalization or
     any other similar transaction effected without the receipt of consideration
     which results in an increase in the number of the Registrant's outstanding
     Shares.

(2)  The 1997 Plan provides for an annual increase in the number of Shares
     reserved and available for issuance under the 1997 Plan equal to the lesser
     of (i) the number of Shares needed to restore the maximum aggregate number
     of Shares which may be optioned and sold under the 1997 Plan to 1,000,000,
     (ii) four percent (4%) of the outstanding Shares, as of the last business
     day of such fiscal year, or (iii) a lesser number of Shares determined by
     the Board of Directors.

(3)  The Proposed Maximum Offering Price Per Share has been estimated in
     accordance with Rule 457(c) under the Securities Act of 1933, as amended
     (the "Securities Act") solely for the purpose of calculating the
     registration fee on the basis of the average of the high and low prices of
     Registrant's Common Stock as reported on Nasdaq National Market on December
     17, 1999.

(4)  The ESPP provides for an annual increase in the number of Shares reserved
     and available for issuance under the ESPP equal to the lesser of (i) the
     number of Shares needed to restore the maximum aggregate number of Shares
     which may be sold under the ESPP to 400,000, (ii) one percent (1%) of the
     outstanding Shares as of the last business day of such fiscal year, or
     (iii) a lesser number of Shares determined by the Board of Directors.

(5)  The Proposed Maximum Offering Price Per Share has been estimated in
     accordance with Rule 457(c) under the Securities Act solely for the purpose
     of calculating the registration fee on the basis of the average of the high
     and low prices of Registrant's Common Stock as reported on Nasdaq National
     Market on December 17, 1999, multiplied by 85%, which is the percentage of
     the trading price applicable to purchases under the ESPP.

================================================================================
<PAGE>

                                    PART II
              INFORMATION REQUIRED IN THE REGISTRATION STATEMENT

Item 3.  Incorporation of Documents by Reference.

         The following documents and information filed with the Securities and
Exchange Commission (the "Commission") by the Registrant are hereby incorporated
by reference:

         (a)      The Registrant's Annual Report on Form 10-K for the fiscal
                  year ended September 30, 1998 filed pursuant to the Securities
                  Exchange Act of 1934, as amended (the "Exchange Act");

         (b)      The Registrant's Quarterly Reports on Form 10-Q for the fiscal
                  quarters ended December 31, 1998, March 31, 1999 and June 30,
                  1999 filed pursuant to the Exchange Act; and

         (c)      The description of Registrant's Common Stock contained in the
                  Registrant's Registration Statement on Form 8-A dated April 2,
                  1997, filed pursuant to Section 12(g) of the Exchange Act
                  which was declared effective on May 13, 1997, including any
                  amendment or report filed for the purpose of updating such
                  description.

         All documents filed by the Registrant pursuant to Sections 13(a),
13(c), 14 and 15(d) of the Exchange Act after the date hereof, and prior to the
filing of a post-effective amendment to this Registration Statement which
indicates that all securities offered hereby have been sold or which deregisters
all securities then remaining unsold, shall be deemed to be incorporated by
reference herein and to be part hereof from the date of filing of such
documents. Any statement contained herein or in a document incorporated or
deemed to be incorporated by reference herein shall be deemed to be modified or
superseded for purposes of this Registration Statement to the extent that a
statement contained herein or in any other subsequently filed document which
also is or is deemed to be incorporated by reference herein modifies or
supersedes such earlier statement. Any statement so modified or superseded shall
not be deemed, except as so modified or superseded, to constitute a part of this
Registration Statement.

Item 4.           Description of Securities.

         Not applicable.

Item 5.           Interests of Named Experts and Counsel.

         As of September 30, 1999, a member of Wilson Sonsini Goodrich & Rosati,
Professional Corporation, beneficially owned 1,000 shares of the Company's
Common Stock.

Item 6.           Indemnification of Directors and Officers.

         The Company's Amended and Restated Certificate of Incorporation limits
the liability of directors to the maximum extent permitted by Delaware law.
Delaware law provides that a corporation's certificate of incorporation may
contain, and the Company's Amended and Restated Certificate of Incorporation
does contain, a provision eliminating or limiting the personal liability of a
director for monetary damages for breach of their fiduciary duties as directors,
except for liability (i) for any breach of their duty of loyalty to the
corporation or its stockholders, (ii) for acts or omissions not in good faith
for which involve intentional misconduct or a knowing violation of law, (iii)
for unlawful payments of
<PAGE>

dividend or unlawful stock repurchases or redemptions as provided in Section 174
of the Delaware General Corporation Law or (iv) for any transaction from which
the director derived an improper personal benefit.

         The Company's Amended and Restated Bylaws provide that the Company
shall indemnify its directors, officers, employees and agents to the fullest
extent permitted by law. The Company believes that the indemnification under its
Amended and Restated Bylaws covers at least negligence and gross negligence on
the part of indemnified parties.

         The Company has entered into agreements to indemnify its directors and
officers, in addition to the indemnification provided for in the Company's
Amended and Restated Bylaws. These agreements, among other things, indemnify the
Company's directors and officers for certain expenses (including attorney fees),
judgments, fines and settlement amounts incurred by any such person in any
action or proceeding, including any action by or in the right of the Company,
arising out of such person's services as a director or officer of the company,
any subsidiary of the Company or any other company or enterprise to which the
person provides services at the request of the Company. The Company believes
that these provisions and agreements are necessary to attract and retain
qualified directors and officers.

         At present, there is no pending litigation or proceeding involving any
director, officer, employee or agent of the Company where indemnifications will
be required or permitted. The Company is not aware of any threatened litigation
or proceeding that might result in a claim for such indemnification.

Item 7.           Exemption from Registration Claimed.

         Not applicable.

Item 8.           Exhibits.

     Exhibit
      Number                            Description of Document

       4.1*   Amended and Restated Certificate of Incorporation of Registrant.

       4.2*   Certificate of Designation of Rights, Preferences and Privileges
              of Series E Participating Preferred Stock of Registrant.

       4.3*   Amended and Restated Bylaws of Registrant dated February 28, 1997.

       4.4    1997 Stock Plan.

       4.5**  1997 Employee Stock Purchase Plan.

       4.6    1999 Nonstatutory Stock Option Plan.

       5.1    Opinion of Wilson Sonsini Goodrich & Rosati, Professional
              Corporation, as to legality of securities being registered.

       23.1   Consent of PricewaterhouseCoopers LLP, Independent Accountants.

       23.2   Consent of Wilson Sonsini Goodrich & Rosati, Professional
              Corporation (contained in exhibit 5.1).

       24.1   Powers of Attorney (included as part of the signature page of this
              registration statement).

*      Incorporated by reference to the Registrant's Registration Statement on
Form S-1, as amended (file No. 333-22885).
<PAGE>

**     Incorporated by reference to the Registrant's Registration Statement on
Form S-8 filed June 6, 1997 (file No. 333-28597).


Item 9.           Undertakings.

         (a)      The undersigned Registrant hereby undertakes:

                  (1) To file, during any period in which offers or sales are
being made, a post-effective amendment to this registration statement:

                           (i)   To include any prospectus required by section
10(a)(3) of the Securities Act of 1933;

                           (ii)  To reflect in the prospectus any facts or
events arising after the effective date of the registration statement (or the
most recent post-effective amendment thereof) which, individually or in the
aggregate, represent a fundamental change in the information set forth in the
registration statement. Notwithstanding the foregoing, any increase or decrease
in volume of securities offered (if the total dollar value of securities offered
would not exceed that which was registered) and any deviation from the low or
high end of the estimated maximum offering range may be reflected in the form of
prospectus filed with the Commission pursuant to Rule 424(b) if, in the
aggregate, the changes in volume and price represent no more than a 20% change
in the maximum aggregate offering price set forth in the "Calculation of
Registration Fee" table in the effective registration statement.

                           (iii) To include any material information with
respect to the plan of distribution not previously disclosed in the registration
statement or any material change to such information in the registration
statement.

         Provided, however, that paragraphs (a)(1)(i) and (a)(1)(ii) do not
apply if the information required to be included in a post-effective amendment
by those paragraphs is contained in periodic reports filed with or furnished to
the Commissioner by the Registrant pursuant to section 13 or section 15(d) of
the Securities Exchange Act of 1934 that are incorporated by reference in this
registration statement.

                  (2) That, for the purpose of determining any liability under
the Securities Act of 1933, each such post-effective amendment shall be deemed
to be a new registration statement relating to the securities offered therein,
and the offering of such securities at that time shall be deemed to be the
initial bona fide offering thereof.

                  (3) To remove from registration by means of a post-effective
amendment any of the securities being registered which remain unsold at the
termination of the offering.

          (b)     The undersigned Registrant hereby undertakes that, for
purposes of determining any liability under the Securities Act of 1933, each
filing of the Registrant's annual report pursuant to section 13(a) or section
15(d) of the Securities Exchange Act of 1934 (and, where applicable, each filing
of an employee benefit plan's annual report pursuant to section 15(d) of the
Securities Exchange Act of 1934) that is incorporated by reference in the
registration statement shall be deemed to be a new
<PAGE>

registration statement relating to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof.

         (c)      Insofar as indemnification for liabilities arising under the
Securities Act of 1933 may be permitted to directors, officers and controlling
persons of the Registrant pursuant to the foregoing provisions, or otherwise,
the Registrant has been advised that in the opinion of the Securities and
Exchange Commission such indemnification is against public policy as expressed
in the Act and is, therefore, unenforceable. In the event that a claim for
indemnification against such liabilities (other than the payment by the
Registrant of expenses incurred or paid by a director, officer or controlling
person of the Registrant in the successful defense of any action, suit or
proceeding) is asserted by such director, officer or controlling person in
connection with the securities being registered, the Registrant will, unless in
the opinion of its counsel the matter has been settled by controlling precedent,
submit to a court of appropriate jurisdiction the question whether such
indemnification by it is against public policy as expressed in the Securities
Act of 1933 and will be governed by the final adjudication of such issue.
<PAGE>

                                   SIGNATURES

         Pursuant to the requirements of the Securities Act of 1933, the
Registrant certifies that it has reasonable grounds to believe that it meets all
of the requirements for filing on Form S-8 and has duly caused this Registration
Statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the City of Mountain View, State of California, on this 22nd day
of December, 1999.


                                         RAMBUS INC.


                                         By:  /s/ GARY G. HARMON
                                            ------------------------------------
                                              Gary G. Harmon
                                              Vice President, Finance and
                                              Chief Financial Officer



                               POWER OF ATTORNEY

    KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears
below hereby constitutes and appoints Geoffrey R. Tate and Gary G. Harmon,
jointly and severally, his attorney-in-fact, each with full power of
substitution, for him and in any and all capacities, to sign any amendments to
this Registration Statement on form S-8, and to file the same, with exhibits
thereto and other documents in connection therewith, with the Securities and
Exchange Commission, hereby ratifying confirming all that each said
attorney-in-fact, or his substitute or substitutes, may lawfully do or cause to
be done by virtue hereof.

   Pursuant to the requirements of the Securities Act of 1933, this Registration
Statement has been signed by the following persons in the capacities and on the
dates indicated:

Signatures                     Title                    Date
- ----------                     -----                    ----

/s/ GEOFFREY R. TATE           Chief Executive Officer  December 22, 1999
- --------------------------     and Director (principal
     Geoffrey R. Tate          executive officer)


/s/ GARY G. HARMON             Sr. Vice President,      December 22, 1999
- --------------------------     Finance and Chief
    Gary G. Harmon             Financial Officer
                               (principal financial
                               and accounting officer)

/s/ DAVID MOORING              President and Director   December 22, 1999
- --------------------------
    David Mooring


/s/ BRUCE DUNLEVIE              Director                December 22, 1999
- --------------------------
    Bruce Dunlevie


/s/ CHARLES GESCHKE             Director                December 22, 1999
- --------------------------
    Charles Geschke


/s/ MARK HOROWITZ               Director                December 22, 1999
- --------------------------
    Mark Horowitz
<PAGE>

                                Index to Exhibits



       Exhibit
        Number                   Description of Document

         4.1*     Amended and Restated Certificate of Incorporation of
                  Registrant.

         4.2*     Certificate of Designation of Rights, Preferences and
                  Privileges of Series E Participating Preferred Stock of
                  Registrant.

         4.3*     Amended and Restated Bylaws of Registrant dated February 28,
                  1997.

         4.4      1997 Stock Plan.

         4.5**    1997 Employee Stock Purchase Plan.

         4.6      1999 Nonstatutory Stock Option Plan.

         5.1      Opinion of Wilson Sonsini Goodrich & Rosati, Professional
                  Corporation, as to legality of securities being registered.

         23.1     Consent of PricewaterhouseCoopers LLP, Independent
                  Accountants.

         23.2     Consent of Wilson Sonsini Goodrich & Rosati, Professional
                  Corporation (contained in exhibit 5.1).

         24.1     Powers of Attorney (included as part of the signature page of
                  this registration statement).

*    Incorporated by reference to the Registrant's Registration Statement on
Form S-1, as amended (file No. 333-22885).

**   Incorporated by reference to the Registrant's Registration Statement on
Form S-8 filed June 6, 1997 (file No. 333-28597).

<PAGE>

                                                                     EXHIBIT 4.4

                                   RAMBUS INC.
                                 1997 STOCK PLAN


        1.      Purposes of the Plan. The purposes of this Stock Plan are:
                --------------------

                .       to attract and retain the best available personnel for
                        positions of substantial responsibility,

                .       to provide additional incentive to Employees, Directors
                        and Consultants, and

                .       to promote the success of the Company's business.

        Options granted under the Plan may be Incentive Stock Options or
Nonstatutory Stock Options, as determined by the Administrator at the time of
grant. Stock Purchase Rights and Common Stock Equivalents may also be granted
under the Plan. The Plan also provides for automatic grants of Nonstatutory
Stock Options to Outside Directors.

        2.      Definitions. As used herein, the following definitions shall
                -----------
                apply:

                (a)     "Administrator" means the Board or any of its Committees
                         -------------
as shall be administering the Plan, in accordance with Section 4 of the Plan.

                (b)     "Applicable Laws" means the requirements relating to the
                         ---------------
administration of stock option plans under U. S. state corporate laws, U.S.
federal and state securities laws, the Code, any stock exchange or quotation
system on which the Common Stock is listed or quoted and the applicable laws of
any foreign country or jurisdiction where Awards are, or will be, granted under
the Plan.

                (c)     "Award" means an award of Options, Stock Purchase Rights
                         -----
or Common Stock Equivalents pursuant to the terms of the Plan.

                (d)     "Board" means the Board of Directors of the Company.
                         -----

                (e)     "Code" means the Internal Revenue Code of 1986, as
                         ----
amended.

                (f)     "Committee" means a committee of Directors appointed by
                         ---------
the Board in accordance with Section 4 of the Plan.

                (g)     "Common Stock" means the common stock of the Company.
                         ------------
<PAGE>

                (h)     "Common Stock Equivalent" means an unfunded and
                         -----------------------
unsecured right to receive Shares in the future that may be granted to a Service
Provider pursuant to Section 12.

                (i)     "Common Stock Equivalent Agreement" means a written
                         ---------------------------------
agreement between the Company and a Service Provider evidencing the terms and
conditions of an individual Common Stock Equivalent grant or Award.

                (j)     "Company" means Rambus Inc., a Delaware corporation.
                         -------

                (k)     "Consultant" means any person, including an advisor,
                         ----------
engaged by the Company or a Parent or Subsidiary to render services to such
entity.

                (l)     "Director" means a member of the Board.
                         --------

                (m)     "Disability" means total and permanent disability as
                         ----------
defined in Section 22(e)(3) of the Code.

                (n)     "Employee" means any person, including Officers and
                         --------
Directors, employed by the Company or any Parent or Subsidiary of the Company. A
Service Provider shall not cease to be an Employee in the case of (i) any leave
of absence approved by the Company or (ii) transfers between locations of the
Company or between the Company, its Parent, any Subsidiary, or any successor.
For purposes of Incentive Stock Options, no such leave may exceed ninety days,
unless reemployment upon expiration of such leave is guaranteed by statute or
contract. If reemployment upon expiration of a leave of absence approved by the
Company is not so guaranteed, on the 181st day of such leave any Incentive Stock
Option held by the Optionee shall cease to be treated as an Incentive Stock
Option and shall be treated for tax purposes as a Nonstatutory Stock Option.
Neither service as a Director nor payment of a director's fee by the Company
shall be sufficient to constitute "employment" by the Company.

                (o)     "Exchange Act" means the Securities Exchange Act of
                         ------------
1934, as amended.

                (p)     "Fair Market Value" means, as of any date, the value of
                         -----------------
Common Stock determined as follows:

                        (i)     If the Common Stock is listed on any established
stock exchange or a national market system, including without limitation the
Nasdaq National Market or The Nasdaq SmallCap Market of The Nasdaq Stock Market,
its Fair Market Value shall be the closing sales price for such stock (or the
closing bid, if no sales were reported) as quoted on such exchange or system for
the last market trading day prior to the time of determination, as reported in
The Wall Street Journal or such other source as the Administrator deems
reliable;
<PAGE>

                        (ii)    If the Common Stock is regularly quoted by a
recognized securities dealer but selling prices are not reported, the Fair
Market Value of a Share of Common Stock shall be the mean between the high bid
and low asked prices for the Common Stock on the last market trading day prior
to the day of determination, as reported in The Wall Street Journal or such
other source as the Administrator deems reliable; or

                        (iii)   In the absence of an established market for the
Common Stock, the Fair Market Value shall be determined in good faith by the
Administrator.

                (q)     "Incentive Stock Option" means an Option intended to
                         ----------------------
qualify as an incentive stock option within the meaning of Section 422 of the
Code and the regulations promulgated thereunder.

                (r)     "Inside Director" means a Director who is an Employee.
                         ---------------
The term Inside Director shall include the founders, Mike Farmwald and Mark
Horowitz.

                (s)     "Nonstatutory Stock Option" means an Option not intended
                         -------------------------
to qualify as an Incentive Stock Option.

                (t)     "Notice of Grant" means a written or electronic notice
                         ---------------
evidencing certain terms and conditions of an individual Option or Stock
Purchase Right grant. The Notice of Grant is part of the Option Agreement.

                (u)     "Officer" means a person who is an officer of the
                         -------
Company within the meaning of Section 16 of the Exchange Act and the rules and
regulations promulgated thereunder.

                (v)     "Option" means a stock option granted pursuant to the
                         ------
Plan.

                (w)     "Option Agreement" means an agreement between the
                         ----------------
Company and an Optionee evidencing the terms and conditions of an individual
Option grant. The Option Agreement is subject to the terms and conditions of the
Plan.

                (x)     "Option Exchange Program" means a program whereby
                         -----------------------
outstanding Options are surrendered in exchange for Options with a lower
exercise price.

                (y)     "Outside Director" means a Director who is not an
                         ----------------
Employee; provided, however, that such term shall not include the founders, Mike
Farmwald and Mark Horowitz.

                (z)     "Optioned Stock" means the Common Stock subject to an
                         --------------
Option or Stock Purchase Right.
<PAGE>

                (aa)    "Optionee" means the holder of an outstanding Option or
                         --------
Stock Purchase Right granted under the Plan.

                (bb)    "Parent" means a "parent corporation," whether now or
                         ------
hereafter existing, as defined in Section 424(e) of the Code.

                (cc)    "Plan" means this 1997 Stock Plan.
                         ----

                (dd)    "Restricted Stock" means shares of Common Stock acquired
                         ----------------
pursuant to a grant of Stock Purchase Rights under Section 11 of the Plan.

                (ee)    "Restricted Stock Purchase Agreement" means a written
                         -----------------------------------
agreement between the Company and the Optionee evidencing the terms and
restrictions applying to stock purchased under a Stock Purchase Right. The
Restricted Stock Purchase Agreement is subject to the terms and conditions of
the Plan and the Notice of Grant.

                (ff)    "Rule 16b-3" means Rule 16b-3 of the Exchange Act or any
                         ----------
successor to Rule 16b-3, as in effect when discretion is being exercised with
respect to the Plan.

                (gg)    "Section 16(b)" means Section 16(b) of the Exchange Act.
                         -------------

                (hh)    "Service Provider" means an Employee, Director or
                         ----------------
Consultant.

                (ii)    "Share" means a share of the Common Stock, as adjusted
                         -----
in accordance with Section 15 of the Plan.

                (jj)    "Stock Purchase Right" means the right to purchase
                         --------------------
Common Stock pursuant to Section 11 of the Plan, as evidenced by a Notice of
Grant.

                (kk)    "Subsidiary" means a "subsidiary corporation", whether
                         ----------
now or hereafter existing, as defined in Section 424(f) of the Code.

        3.      Stock Subject to the Plan. Subject to the provisions of Section
                -------------------------
15 of the Plan, the maximum aggregate number of Shares which may be optioned and
sold under the Plan is 1,000,000 Shares, plus an annual increase as of the last
day of each of the Company's immediately preceding fiscal years during the term
of the Plan equal to the lesser of (i) the number of Shares needed to restore
the maximum aggregate number of Shares which may be optioned and sold under the
Plan to 1,000,000 Shares, (ii) four percent (4%) of the outstanding Shares on
such date, or (iii) a lesser amount determined by the Board. The Shares may be
authorized, but unissued, or reacquired Common Stock.
<PAGE>

                If an Option or Stock Purchase Right expires or becomes
unexercisable without having been exercised in full, or is surrendered pursuant
to an Option Exchange Program, the unpurchased Shares which were subject thereto
shall become available for future grant or sale under the Plan (unless the Plan
has terminated); provided, however, that Shares that have actually been issued
                 --------
under the Plan, whether upon exercise of an Option or Right, shall not be
returned to the Plan and shall not become available for future distribution
under the Plan, except that if Shares of Restricted Stock are repurchased by the
Company at their original purchase price, such Shares shall become available for
future grant under the Plan.

        4.      Administration of the Plan.
                --------------------------

                (a)     Procedure.
                        ---------

                        (i)     Multiple Administrative Bodies. The Plan may be
                                ------------------------------
administered by different Committees with respect to different groups of Service
Providers.

                        (ii)    Section 162(m). To the extent that the
                                --------------
Administrator determines it to be desirable to qualify Options granted hereunder
as "performance-based compensation" within the meaning of Section 162(m) of the
Code, the Plan shall be administered by a Committee of two or more "outside
directors" within the meaning of Section 162(m) of the Code.

                        (iii)   Rule 16b-3. To the extent desirable to qualify
                                ----------
transactions hereunder as exempt under Rule 16b-3, the transactions contemplated
hereunder shall be structured to satisfy the requirements for exemption under
Rule 16b-3.

                        (iv)    Grants to Outside Directors. All grants of
                                ---------------------------
Options to Outside Directors made pursuant to Section 14 of the Plan shall be
automatic and nondiscretionary.

                        (v)     Other Administration. Other than as provided
                                --------------------
above, the Plan shall be administered by (A) the Board or (B) a Committee, which
committee shall be constituted to satisfy Applicable Laws.

                (b)     Powers of the Administrator. Subject to the provisions
                        ---------------------------
of the Plan, and in the case of a Committee, subject to the specific duties
delegated by the Board to such Committee, the Administrator shall have the
authority, in its discretion:

                        (i)     to determine the Fair Market Value;

                        (ii)    to select the Service Providers to whom Awards
may be granted hereunder;

                        (iii)   to determine the number of shares of Common
Stock to be covered by each Award granted hereunder;
<PAGE>

                        (iv)    to approve forms of agreement for use under the
Plan;

                        (v)     to determine the terms and conditions, not
inconsistent with the terms of the Plan, of any Award granted hereunder. Such
terms and conditions include, but are not limited to, the exercise price, the
time or times when Options or Stock Purchase Rights may be exercised (which may
be based on performance criteria), the time or times when Common Stock
Equivalents may be converted to Shares, any vesting acceleration or waiver of
forfeiture restrictions, and any restriction or limitation regarding any Award
or the Shares relating thereto, based in each case on such factors as the
Administrator, in its sole discretion, shall determine;

                        (vi)    to reduce the exercise price of any Option or
Stock Purchase Right to the then current Fair Market Value, or to adjust the
number of Shares subject to a Common Stock Equivalent, if the Fair Market Value
of the Common Stock shall have declined since the date the Award was granted;

                        (vii)   to institute an Option Exchange Program;

                        (viii)  to construe and interpret the terms of the Plan
and Awards granted pursuant to the Plan;

                        (ix)    to prescribe, amend and rescind rules and
regulations relating to the Plan, including rules and regulations relating to
sub-plans established for the purpose of qualifying for preferred tax treatment
under foreign tax laws;

                        (x)     to modify or amend each Award (subject to
Section 17(c) of the Plan), including the discretionary authority to extend the
post-termination exercisability period of Options longer than is otherwise
provided for in the Plan;

                        (xi)    to allow Optionees to satisfy withholding tax
obligations by electing to have the Company withhold from the Shares to be
issued upon exercise of an Option or Stock Purchase Right that number of Shares
having a Fair Market Value equal to the amount required to be withheld. The Fair
Market Value of the Shares to be withheld shall be determined on the date that
the amount of tax to be withheld is to be determined. All elections by an
Optionee to have Shares withheld for this purpose shall be made in such form and
under such conditions as the Administrator may deem necessary or advisable;

                        (xii)   to authorize any person to execute on behalf of
the Company any instrument required to effect the grant of an Option or Stock
Purchase Right previously granted by the Administrator;
<PAGE>

                        (xiii)  to make all other determinations deemed
necessary or advisable for administering the Plan.

                (c)     Effect of Administrator's Decision. The Administrator's
                        ----------------------------------
decisions, determinations and interpretations shall be final and binding on all
Optionees and any other holders of Awards.

        5.      Eligibility. Nonstatutory Stock Options, Stock Purchase Rights
                -----------
and Common Stock Equivalents may be granted to Service Providers. Incentive
Stock Options may be granted only to Employees.

        6.      Limitations.
                -----------

                (a)     Each Option shall be designated in the Option Agreement
as either an Incentive Stock Option or a Nonstatutory Stock Option. However,
notwithstanding such designation, to the extent that the aggregate Fair Market
Value of the Shares with respect to which Incentive Stock Options are
exercisable for the first time by the Optionee during any calendar year (under
all plans of the Company and any Parent or Subsidiary) exceeds $100,000, such
Options shall be treated as Nonstatutory Stock Options. For purposes of this
Section 6(a), Incentive Stock Options shall be taken into account in the order
in which they were granted. The Fair Market Value of the Shares shall be
determined as of the time the Option with respect to such Shares is granted.

                (b)     Neither the Plan nor any Award shall confer upon an
Optionee any right with respect to continuing the Optionee's relationship as a
Service Provider with the Company, nor shall they interfere in any way with the
Optionee's right or the Company's right to terminate such relationship at any
time, with or without cause.

                (c)     The following limitations shall apply to grants of
Options:

                        (i)     No Service Provider shall be granted, in any
fiscal year of the Company, Options to purchase more than 250,000 Shares.

                        (ii)    In connection with his or her initial service, a
Service Provider may be granted Options to purchase up to an additional 250,000
Shares which shall not count against the limit set forth in subsection (i)
above.

                        (iii)   The foregoing limitations shall be adjusted
proportionately in connection with any change in the Company's capitalization as
described in Section 15.

                        (iv)    If an Option is canceled in the same fiscal year
of the Company in which it was granted (other than in connection with a
transaction described in Section 15), the canceled Option will be counted
against the limits set forth in subsections (i) and (ii) above. For this
purpose,
<PAGE>

if the exercise price of an Option is reduced, the transaction will be treated
as a cancellation of the Option and the grant of a new Option.

        7.      Term of Plan. Subject to Section 21 of the Plan, the Plan shall
                ------------
become effective upon its adoption by the Board. It shall continue in effect for
a term of ten (10) years unless terminated earlier under Section 17 of the Plan.

        8.      Term of Option. The term of each Option shall be stated in the
                --------------
Option Agreement. In the case of an Incentive Stock Option, the term shall be
ten (10) years from the date of grant or such shorter term as may be provided in
the Option Agreement. Moreover, in the case of an Incentive Stock Option granted
to an Optionee who, at the time the Incentive Stock Option is granted, owns
stock representing more than ten percent (10%) of the total combined voting
power of all classes of stock of the Company or any Parent or Subsidiary, the
term of the Incentive Stock Option shall be five (5) years from the date of
grant or such shorter term as may be provided in the Option Agreement.

        9.      Option Exercise Price and Consideration.
                ---------------------------------------

                (a)     Exercise Price. The per share exercise price for the
                        --------------
Shares to be issued pursuant to exercise of an Option shall be determined by the
Administrator, subject to the following:

                        (i)     In the case of an Incentive Stock Option

                                (A)     granted to an Employee who, at the time
the Incentive Stock Option is granted, owns stock representing more than ten
percent (10%) of the voting power of all classes of stock of the Company or any
Parent or Subsidiary, the per Share exercise price shall be no less than 110% of
the Fair Market Value per Share on the date of grant.

                                (B)     granted to any Employee other than an
Employee described in paragraph (A) immediately above, the per Share exercise
price shall be no less than 100% of the Fair Market Value per Share on the date
of grant.

                        (ii)    In the case of a Nonstatutory Stock Option, the
per Share exercise price shall be determined by the Administrator. In the case
of a Nonstatutory Stock Option intended to qualify as "performance-based
compensation" within the meaning of Section 162(m) of the Code, the per Share
exercise price shall be no less than 100% of the Fair Market Value per Share on
the date of grant.

                        (iii)   Notwithstanding the foregoing, Options may be
granted with a per Share exercise price of less than 100% of the Fair Market
Value per Share on the date of grant pursuant to a merger or other corporate
transaction.
<PAGE>

                (b)     Waiting Period and Exercise Dates. At the time an Option
                        ---------------------------------
is granted, the Administrator shall fix the period within which the Option may
be exercised and shall determine any conditions which must be satisfied before
the Option may be exercised.

                (c)     Form of Consideration. The Administrator shall determine
                        ---------------------
the acceptable form of consideration for exercising an Option, including the
method of payment. In the case of an Incentive Stock Option, the Administrator
shall determine the acceptable form of consideration at the time of grant. Such
consideration may consist entirely of:

                        (i)     cash;

                        (ii)    check;

                        (iii)   promissory note;

                        (iv)    other Shares which (A) in the case of Shares
acquired upon exercise of an option, have been owned by the Optionee for more
than six months on the date of surrender, and (B) have a Fair Market Value on
the date of surrender equal to the aggregate exercise price of the Shares as to
which said Option shall be exercised;

                        (v)     consideration received by the Company under a
cashless exercise program implemented by the Company in connection with the
Plan;

                        (vi)    a reduction in the amount of any Company
liability to the Optionee, including any liability attributable to the
Optionee's participation in any Company-sponsored deferred compensation program
or arrangement;

                        (vii)   any combination of the foregoing methods of
payment; or

                        (viii)  such other consideration and method of payment
for the issuance of Shares to the extent permitted by Applicable Laws.

        10.     Exercise of Option.
                ------------------

                (a)     Procedure for Exercise; Rights as a Stockholder. Any
                        -----------------------------------------------
Option granted hereunder shall be exercisable according to the terms of the Plan
and at such times and under such conditions as determined by the Administrator
and set forth in the Option Agreement. Unless the Administrator provides
otherwise, vesting of Options granted hereunder shall be tolled during any
unpaid leave of absence. An Option may not be exercised for a fraction of a
Share.

                        An Option shall be deemed exercised when the Company
receives: (i) written or electronic notice of exercise (in accordance with the
Option Agreement) from the person entitled to
<PAGE>

exercise the Option, and (ii) full payment for the Shares with respect to which
the Option is exercised. Full payment may consist of any consideration and
method of payment authorized by the Administrator and permitted by the Option
Agreement and the Plan. Shares issued upon exercise of an Option shall be issued
in the name of the Optionee or, if requested by the Optionee, in the name of the
Optionee and his or her spouse. Until the Shares are issued (as evidenced by the
appropriate entry on the books of the Company or of a duly authorized transfer
agent of the Company), no right to vote or receive dividends or any other rights
as a stockholder shall exist with respect to the Optioned Stock, notwithstanding
the exercise of the Option. The Company shall issue (or cause to be issued) such
Shares promptly after the Option is exercised. No adjustment will be made for a
dividend or other right for which the record date is prior to the date the
Shares are issued, except as provided in Section 15 of the Plan.

                        Exercising an Option in any manner shall decrease the
number of Shares thereafter available, both for purposes of the Plan and for
sale under the Option, by the number of Shares as to which the Option is
exercised.

                (b)     Termination of Relationship as a Service Provider. If an
                        -------------------------------------------------
Optionee ceases to be a Service Provider, other than upon the Optionee's death
or Disability, the Optionee may exercise his or her Option within such period of
time as is specified in the Option Agreement to the extent that the Option is
vested on the date of termination (but in no event later than the expiration of
the term of such Option as set forth in the Option Agreement). In the absence of
a specified time in the Option Agreement, the Option shall remain exercisable
for three (3) months following the Optionee's termination. If, on the date of
termination, the Optionee is not vested as to his or her entire Option, the
Shares covered by the unvested portion of the Option shall revert to the Plan.
If, after termination, the Optionee does not exercise his or her Option within
the time specified by the Administrator, the Option shall terminate, and the
Shares covered by such Option shall revert to the Plan.

                (c)     Disability of Optionee. If an Optionee ceases to be a
                        ----------------------
Service Provider as a result of the Optionee's Disability, the Optionee may
exercise his or her Option within such period of time as is specified in the
Option Agreement to the extent the Option is vested on the date of termination
(but in no event later than the expiration of the term of such Option as set
forth in the Option Agreement). In the absence of a specified time in the Option
Agreement, the Option shall remain exercisable for twelve (12) months following
the Optionee's termination. If, on the date of termination, the Optionee is not
vested as to his or her entire Option, the Shares covered by the unvested
portion of the Option shall revert to the Plan. If, after termination, the
Optionee does not exercise his or her Option within the time specified herein,
the Option shall terminate, and the Shares covered by such Option shall revert
to the Plan.

                (d)     Death of Optionee. If an Optionee dies while a Service
                        -----------------
Provider, the Option may be exercised within such period of time as is specified
in the Option Agreement (but in no event later than the expiration of the term
of such Option as set forth in the Notice of Grant), by the Optionee's
<PAGE>

estate or by a person who acquires the right to exercise the Option by bequest
or inheritance, but only to the extent that the Option is vested on the date of
death. In the absence of a specified time in the Option Agreement, the Option
shall remain exercisable for twelve (12) months following the Optionee's
termination. If, at the time of death, the Optionee is not vested as to his or
her entire Option, the Shares covered by the unvested portion of the Option
shall immediately revert to the Plan. The Option may be exercised by the
executor or administrator of the Optionee's estate or, if none, by the person(s)
entitled to exercise the Option under the Optionee's will or the laws of descent
or distribution. If the Option is not so exercised within the time specified
herein, the Option shall terminate, and the Shares covered by such Option shall
revert to the Plan.

                (e)     Buyout Provisions. The Administrator may at any time
                        -----------------
offer to buy out for a payment in cash or Shares an Option previously granted
based on such terms and conditions as the Administrator shall establish and
communicate to the Optionee at the time that such offer is made.

        11.     Stock Purchase Rights.
                ---------------------

                (a)     Rights to Purchase. Stock Purchase Rights may be issued
                        ------------------
either alone, in addition to, or in tandem with other Awards granted under the
Plan and/or cash awards made outside of the Plan. After the Administrator
determines that it will offer Stock Purchase Rights under the Plan, it shall
advise the offeree in writing or electronically, by means of a Notice of Grant,
of the terms, conditions and restrictions related to the offer, including the
number of Shares that the offeree shall be entitled to purchase, the price to be
paid, and the time within which the offeree must accept such offer. The offer
shall be accepted by execution of a Restricted Stock Purchase Agreement in the
form determined by the Administrator.

                (b)     Repurchase Option. Unless the Administrator determines
                        -----------------
otherwise, the Restricted Stock Purchase Agreement shall grant the Company a
repurchase option exercisable upon the voluntary or involuntary termination of
the purchaser's service with the Company for any reason (including death or
Disability). The purchase price for Shares repurchased pursuant to the
Restricted Stock Purchase Agreement shall be the original price paid by the
purchaser and may be paid by cancellation of any indebtedness of the purchaser
to the Company. The repurchase option shall lapse at a rate determined by the
Administrator.

                (c)     Other Provisions. The Restricted Stock Purchase
                        ----------------
Agreement shall contain such other terms, provisions and conditions not
inconsistent with the Plan as may be determined by the Administrator in its sole
discretion.

                (d)     Rights as a Stockholder. Once the Stock Purchase Right
                        -----------------------
is exercised, the purchaser shall have the rights equivalent to those of a
stockholder, and shall be a stockholder when his or her purchase is entered upon
the records of the duly authorized transfer agent of the Company. No adjustment
will be made for a dividend or other right for which the record date is prior to
the date the Stock Purchase Right is exercised, except as provided in Section 15
of the Plan.
<PAGE>

        12.     Common Stock Equivalents.
                ------------------------

                  (a) Award of Common Stock Equivalents. Common Stock
                      ---------------------------------
Equivalents may be awarded to Service Providers either alone, in addition to, or
in tandem with other Awards granted under the Plan and/or cash awards made
outside of the Plan. An Award of Common Stock Equivalents shall be made pursuant
to a Common Stock Equivalent Agreement in such form as is determined by the
Administrator.

                  (b) Bookkeeping Account; Nontransferability. The number of
                      ---------------------------------------
Common Stock Equivalents awarded pursuant to Section 12(a) to each Service
Provider shall be credited to a bookkeeping account established in the name of
the Service Provider at such time or times as specified in the Service
Provider's Common Stock Equivalent Agreement. The Company's obligation with
respect to such Common Stock Equivalents shall not be funded or secured in any
manner. A Service Provider's right to receive Common Stock Equivalents may not
be assigned or transferred, voluntarily or involuntarily, except as expressly
provided herein.

                  (c) Dividends. If the Company pays a cash dividend with
                      ---------
respect to the Shares at any time while Common Stock Equivalents are credited to
a Service Provider's account, there shall be credited to the Service Provider's
account additional Common Stock Equivalents equal to (i) the dollar amount of
the cash dividend the Service Provider would have received had he or she been
the actual owner of the Shares to which the Common Stock Equivalents then
credited to the Service Provider's account relate, divided by (ii) the Fair
Market Value of one Share on the dividend payment date. The Company will pay the
Service Provider a cash payment in lieu of fractional Common Stock Equivalents
on the date of such dividend payment.

                  (d) Conversion. The Company shall deliver to the Service
                      ----------
Provider (or his or her designated beneficiary or estate) a number of Shares
equal to the whole number of Common Stock Equivalents then credited to the
Service Provider's account, at such time or times as specified in the Service
Provider's Common Stock Equivalent Agreement, or as otherwise provided herein.

                  (e) Stockholder Rights. A Service Provider (or his or her
                      ------------------
designated beneficiary or estate) shall not be entitled to any voting or other
stockholder rights as a result of the credit of Common Stock Equivalents to the
Service Provider's account, until certificates representing Shares are delivered
to the Service Provider (or his or her designated beneficiary or estate) upon
conversion of the Service Provider's Common Stock Equivalents pursuant to
Section 12(d).

        13.     Non-Transferability of Awards. Unless determined otherwise by
                -----------------------------
the Administrator, an Award may not be sold, pledged, assigned, hypothecated,
transferred, or disposed of in any manner other than by will or by the laws of
descent or distribution and may be exercised, during the lifetime of the
Optionee, only by the Optionee. If the Administrator makes an Award
transferable, such Award shall contain such additional terms and conditions as
the Administrator deems appropriate.
<PAGE>

        14.     Automatic Option Grants to Outside Directors.
                --------------------------------------------

                  (a) First Option. Each Outside Director who becomes an Outside
                      ------------
Director after the effective date of this Plan shall be automatically granted a
Nonstatutory Stock Option to purchase 10,000 Shares (the "First Option") on the
date on which such person first becomes an Outside Director, whether through
election by the stockholders of the Company or appointment by the Board to fill
a vacancy; provided, however, that an Inside Director who ceases to be an Inside
Director but who remains a Director shall not receive a First Option.

                  (b) Subsequent Option. Each Outside Director shall be
                      -----------------
automatically granted a Nonstatutory Stock Option to purchase 5,000 Shares (a
"Subsequent Option") on October 1 of each year; provided that he or she is then
an Outside Director and, provided further, that as of such date, he or she shall
have served on the Board for at least the preceding six (6) months.

                  (c) Terms of Options. The terms of First Options and
                      ----------------
Subsequent Options granted hereunder shall be as follows:

                              (A) the term of each Option shall be ten (10)
years.

                              (B) the exercise price per Share shall be 100% of
the Fair Market Value per Share on the date of grant. In the event that the date
of grant is not a trading day, the exercise price per Share shall be the Fair
Market Value on the next trading day immediately following the date of grant.

                              (C) 12.5% of the Shares subject to the Option
shall vest six months after the date of grant, and 1/48 of the Shares subject to
the Option shall vest each month thereafter so that 100% of the Shares subject
to the Option shall be vested four (4) years from the grant date, subject to the
Optionee remaining a Service Provider as of such vesting dates.

        15.     Adjustments Upon Changes in Capitalization, Dissolution, Merger
                ---------------------------------------------------------------
or Asset Sale.
- -------------

                  (a) Changes in Capitalization. Subject to any required action
                      -------------------------
by the stockholders of the Company, the number of shares of Common Stock covered
by each outstanding Award, the number of Common Stock Equivalents credited to a
Service Provider's account under Section 12(b) and the number of shares of
Common Stock which have been authorized for issuance under the Plan but as to
which no Awards have yet been granted or which have been returned to the Plan
upon cancellation or expiration of an Award, as well as the price per share of
Common Stock covered by each such outstanding Award, shall be proportionately
adjusted for any increase or decrease in the number of issued shares of Common
Stock resulting from a stock split, reverse stock split, stock dividend,
combination or reclassification of the Common Stock, or any other increase or
decrease in the number of issued shares of Common Stock effected without receipt
of consideration by the
<PAGE>

Company; provided, however, that conversion of any convertible securities of the
Company shall not be deemed to have been "effected without receipt of
consideration." Such adjustment shall be made by the Board, whose determination
in that respect shall be final, binding and conclusive. Except as expressly
provided herein, no issuance by the Company of shares of stock of any class, or
securities convertible into shares of stock of any class, shall affect, and no
adjustment by reason thereof shall be made with respect to, the number or price
of shares of Common Stock subject to an Award.

                  (b) Dissolution or Liquidation. In the event of the proposed
                      --------------------------
dissolution or liquidation of the Company, the Administrator shall notify each
Optionee as soon as practicable prior to the effective date of such proposed
transaction. The Administrator in its discretion may provide: (i) for an
Optionee to have the right to exercise his or her Option until ten (10) days
prior to such transaction as to all of the Optioned Stock covered thereby,
including Shares as to which the Option would not otherwise be exercisable; (ii)
that any Company repurchase option applicable to any Shares purchased upon
exercise of an Option or Stock Purchase Right shall lapse as to all such Shares,
provided the proposed dissolution or liquidation takes place at the time and in
the manner contemplated; and (iii) that any Common Stock Equivalents credited to
a Service Provider's account under Section 12(b) shall convert into Shares (as
provided in Section 12(d)) immediately prior to the consummation of any such
dissolution or liquidation. To the extent it has not been previously exercised,
an Award will terminate immediately prior to the consummation of such proposed
action.

              (c) Merger or Asset Sale. In the event of a merger of the Company
                  --------------------
with or into another corporation, or the sale of substantially all of the assets
of the Company (a "Merger"), each outstanding Award shall be assumed or an
equivalent award substituted by the successor corporation or a Parent or
Subsidiary of the successor corporation (the "Successor Corporation").

                  Following such assumption or substitution in connection with a
Merger, if the Optionee's status as an Employee or employee of the Successor
Corporation, as applicable, is terminated by the Successor Corporation as a
result of an Involuntary Termination (as defined below) other than for Cause (as
defined below) within twelve months following a Merger, then (i) the Optionee
shall fully vest in and have the right to exercise Optionee's Option or Stock
Purchase Right as to all of the Optioned Stock, including Shares as to which
Optionee would not otherwise be vested or exercisable; and (ii) Common Stock
Equivalents credited to a Service Provider's account under Section 12(b) shall
convert into Shares (as provided in Section 12(d)) on the date of such
termination. Thereafter, the Award shall remain exercisable in accordance with
Sections 10(b) through (d) and Section 12 above.

                  For purposes of this section, any of the following events
shall constitute an "Involuntary Termination": (i) without the Employee's
express written consent, a significant reduction of the Employee's duties,
authority or responsibilities, relative to the Employee's duties, authority or
responsibilities as in effect immediately prior to the Merger, or the assignment
to Employee of such reduced duties, authority or responsibilities; (ii) without
the Employee's express written consent, a substantial reduction, without good
business reasons, of the facilities and
<PAGE>

perquisites (including office space and location) available to the Employee
immediately prior to the Merger; (iii) a reduction by the Successor Corporation
in the base salary of the Employee as in effect immediately prior to the Merger;
(iv) a material reduction by the Successor Corporation in the kind or level of
employee benefits, including bonuses, to which the Employee was entitled
immediately prior to the Merger with the result that the Employee's overall
benefits package is significantly reduced; (v) the relocation of the Employee to
a facility or a location more than fifty (50) miles from the Employee's then
present location, without the Employee's express written consent; (vi) any
purported termination of the Employee by the Corporation which is not effected
for Disability or for Cause, or any purported termination for which the grounds
relied upon are not valid; (vii) or any act or set of facts or circumstances
which would, under California case law or statute constitute a constructive
termination of the Employee.

               For purposes of this section, "Cause" shall mean (i) any act of
personal dishonesty taken by the Employee in connection with his
responsibilities as an employee and intended to result in substantial personal
enrichment of the Employee, (ii) the conviction of a felony, (iii) a willful act
by the Employee which constitutes gross misconduct and which is injurious to the
Successor Corporation, and (iv) following delivery to the Employee of a written
demand for performance from the Successor Corporation which describes the basis
for the Successor Corporation's belief that the Employee has not substantially
performed his duties, continued violations by the Employee of the Employee's
obligations to the Successor which are demonstrably willful and deliberate on
the Employee's part.

               In the event that the Successor Corporation refuses to assume or
substitute for the Award, then: (i) the Optionee shall fully vest in and have
the right to exercise the Option or Stock Purchase Right as to all of the
Optioned Stock, including Shares as to which Optionee would not otherwise be
vested or exercisable; and (ii) Common Stock Equivalents credited to a Service
Provider's account under Section 12(b) shall convert into Shares (as provided in
Section 12(d)) immediately prior to the merger or sale of assets. If an Option
or Stock Purchase Right becomes fully vested and exercisable in lieu of
assumption or substitution in the event of a merger or sale of assets, the
Administrator shall notify the Optionee in writing or electronically that the
Option or Stock Purchase Right shall be fully vested and exercisable for a
period of fifteen (15) days from the date of such notice, and the Option or
Stock Purchase Right shall terminate upon the expiration of such period. If a
Common Stock Equivalent converts to Shares in such event, the Administrator
shall notify the Optionee at least fifteen (15) days prior to the consummation
of the proposed transaction. For the purposes of this paragraph, an Award shall
be considered assumed if, following the merger or sale of assets, the award
confers the right to purchase or receive, for each Share of Optioned Stock
subject to the Option or Stock Purchase Right or for each Common Stock
Equivalent, immediately prior to the merger or sale of assets, the consideration
(whether stock, cash, or other securities or property) received in the merger or
sale of assets by holders of Common Stock for each Share held on the effective
date of the transaction (and if holders were offered a choice of consideration,
the type of consideration chosen by the holders of a majority of the outstanding
Shares); provided, however, that if such consideration received in the merger or
sale of assets is not
<PAGE>

solely common stock of the Successor Corporation or its Parent, the
Administrator may, with the consent of the Successor Corporation, provide for
the consideration to be received upon the exercise of the Option or Stock
Purchase Right, for each Share of Optioned Stock subject to the Option or Stock
Purchase Right, or upon conversion of each Common Stock Equivalent, to be solely
common stock of the Successor Corporation or its Parent equal in fair market
value to the per share consideration received by holders of Common Stock in the
merger or sale of assets.

        16.     Date of Grant. The date of grant of an Award shall be, for all
                -------------
purposes, the date on which the Administrator makes the determination granting
such Award, or such other later date as is determined by the Administrator.
Notice of the determination shall be provided to each Optionee within a
reasonable time after the date of such grant.

        17.     Amendment and Termination of the Plan.
                -------------------------------------

                (a) Amendment and Termination. The Board may at any time amend,
                    -------------------------
alter, suspend or terminate the Plan.

                (b) Stockholder Approval. The Company shall obtain stockholder
                    --------------------
approval of any Plan amendment to the extent necessary and desirable to comply
with Applicable Laws.

                (c) Effect of Amendment or Termination. No amendment,
                    ----------------------------------
alteration, suspension or termination of the Plan shall impair the rights of the
holder of any Award, unless mutually agreed otherwise between the holder of such
Award and the Administrator, which agreement must be in writing and signed by
the holder of such Award and the Company. Termination of the Plan shall not
affect the Administrator's ability to exercise the powers granted to it
hereunder with respect to Awards granted under the Plan prior to the date of
such termination.

        18.     Conditions Upon Issuance of Shares.
                ----------------------------------

                (a) Legal Compliance. Shares shall not be issued pursuant to the
                    ----------------
exercise of an Award unless the exercise or conversion of such Award and the
issuance and delivery of such Shares shall comply with Applicable Laws and shall
be further subject to the approval of counsel for the Company with respect to
such compliance.

                (b) Investment Representations. As a condition to the exercise
                    --------------------------
or conversion of an Award, the Company may require the person exercising or
converting such Award to represent and warrant at the time of any such exercise
or conversion that the Shares are being purchased only for investment and
without any present intention to sell or distribute such Shares if, in the
opinion of counsel for the Company, such a representation is required.

        19.     Inability to Obtain Authority. The inability of the Company to
                -----------------------------
obtain authority from any regulatory body having jurisdiction, which authority
is deemed by the Company's counsel to be
<PAGE>

necessary to the lawful issuance and sale of any Shares hereunder, shall relieve
the Company of any liability in respect of the failure to issue or sell such
Shares as to which such requisite authority shall not have been obtained.

        20.     Reservation of Shares. The Company, during the term of this
                ---------------------
Plan, will at all times reserve and keep available such number of Shares as
shall be sufficient to satisfy the requirements of the Plan.

        21.     Stockholder Approval. The Plan shall be subject to approval by
                --------------------
the stockholders of the Company within twelve (12) months after the date the
Plan is adopted. Such stockholder approval shall be obtained in the manner and
to the degree required under Applicable Laws.
<PAGE>

                                  RAMBUS INC.

                                1997 STOCK PLAN
                            STOCK OPTION AGREEMENT

        Unless otherwise defined herein, the terms defined in the Plan shall
have the same defined meanings in this Option Agreement.

I.  NOTICE OF STOCK OPTION GRANT
    ----------------------------

[Optionee's Name and Address]

        You have been granted an option to purchase Common Stock of the Company,
subject to the terms and conditions of the Plan and this Option Agreement, as
follows:

        Grant Number
                                            -------------------------

        Date of Grant
                                            -------------------------

        Vesting Commencement Date
                                            -------------------------
        Exercise Price per Share            $
                                            -------------------------
        Total Number of Shares Granted
                                            -------------------------
        Total Exercise Price                $
                                            -------------------------
        Type of Option:                          Incentive Stock Option
                                            ---
                                                 Nonstatutory Stock Option
                                            ---

        Term/Expiration Date:
                                            -------------------------
     Vesting Schedule:
     -----------------

        This Option may be exercised, in whole or in part, in accordance with
the following schedule:

        12.5% of the Shares subject to the Option shall vest six months after
the date of grant, and 1/48 of the Shares subject to the Option shall vest each
month thereafter so that 100% of the Shares subject to the Option shall be
vested four (4) years from the grant date, subject to the Optionee remaining a
Service Provider as of such vesting dates.
<PAGE>

        Termination Period:
        -------------------

        This Option may be exercised for three months after Optionee ceases to
be a Service Provider. Upon the death or Disability of the Optionee, this Option
may be exercised for such longer period as provided in the Plan. In no event
shall this Option be exercised later than the Term/Expiration Date as provided
above.

II.  AGREEMENT
     ---------

        1       Grant of Option. The Plan Administrator of the Company hereby
                ---------------
grants to the Optionee named in the Notice of Grant attached as Part I of this
Agreement (the "Optionee") an option (the "Option") to purchase the number of
Shares, as set forth in the Notice of Grant, at the exercise price per share set
forth in the Notice of Grant (the "Exercise Price"), subject to the terms and
conditions of the Plan, which is incorporated herein by reference. Subject to
Section 17(c) of the Plan, in the event of a conflict between the terms and
conditions of the Plan and the terms and conditions of this Option Agreement,
the terms and conditions of the Plan shall prevail.

                If designated in the Notice of Grant as an Incentive Stock
Option ("ISO"), this Option is intended to qualify as an Incentive Stock Option
under Section 422 of the Code. However, if this Option is intended to be an
Incentive Stock Option, to the extent that it exceeds the $100,000 rule of Code
Section 422(d) it shall be treated as a Nonstatutory Stock Option ("NSO").

        2       Exercise of Option.
                ------------------

                (a) Right to Exercise. This Option is exercisable during its
                    -----------------
term in accordance with the Vesting Schedule set out in the Notice of Grant and
the applicable provisions of the Plan and this Option Agreement.

                (b) Method of Exercise. This Option is exercisable by delivery
                    ------------------
of an exercise notice, in the form attached as Exhibit A (the "Exercise
Notice"), which shall state the election to exercise the Option, the number of
Shares in respect of which the Option is being exercised (the "Exercised
Shares"), and such other representations and agreements as may be required by
the Company pursuant to the provisions of the Plan. The Exercise Notice shall be
completed by the Optionee and delivered to the Stockholder Relations Manager of
the Company. The Exercise Notice shall be accompanied by payment of the
aggregate Exercise Price as to all Exercised Shares. This Option shall be deemed
to be exercised upon receipt by the Company of such fully executed Exercise
Notice accompanied by such aggregate Exercise Price.

                No Shares shall be issued pursuant to the exercise of this
Option unless such issuance and exercise complies with Applicable Laws. Assuming
such compliance, for income tax purposes the Exercised Shares shall be
considered transferred to the Optionee on the date the Option is exercised with
respect to such Exercised Shares.
<PAGE>

        3       Method of Payment. Payment of the aggregate Exercise Price shall
                -----------------
be by any of the following, or a combination thereof, at the election of the
Optionee:

                (a) cash;

                (b) check;

                (c) consideration received by the Company under a cashless
exercise program implemented by the Company in connection with the Plan; or

                (d) surrender of other Shares which (i) in the case of Shares
acquired upon exercise of an option, have been owned by the Optionee for more
than six (6) months on the date of surrender, and (ii) have a Fair Market Value
on the date of surrender equal to the aggregate Exercise Price of the Exercised
Shares.

        4       Non-Transferability of Option. This Option may not be
                -----------------------------
transferred in any manner otherwise than by will or by the laws of descent or
distribution and may be exercised during the lifetime of Optionee only by the
Optionee. The terms of the Plan and this Option Agreement shall be binding upon
the executors, administrators, heirs, successors and assigns of the Optionee.

        5       Term of Option. This Option may be exercised only within the
                --------------
term set out in the Notice of Grant, and may be exercised during such term only
in accordance with the Plan and the terms of this Option Agreement.

        6       Tax Consequences. Some of the federal tax consequences relating
                ----------------
to this Option, as of the date of this Option, are set forth below. THIS SUMMARY
IS NECESSARILY INCOMPLETE, AND THE TAX LAWS AND REGULATIONS ARE SUBJECT TO
CHANGE. THE OPTIONEE SHOULD CONSULT A TAX ADVISER BEFORE EXERCISING THIS OPTION
OR DISPOSING OF THE SHARES.

                (a)     Exercising the Option.
                        ---------------------

                        (i)     Nonstatutory Stock Option. The Optionee may
                                -------------------------
incur regular federal income tax liability upon exercise of a NSO. The Optionee
will be treated as having received compensation income (taxable at ordinary
income tax rates) equal to the excess, if any, of the Fair Market Value of the
Exercised Shares on the date of exercise over their aggregate Exercise Price. If
the Optionee is an Employee or a former Employee, the Company will be required
to withhold from his or her compensation or collect from Optionee and pay to the
applicable taxing authorities an amount in cash equal to a percentage of this
compensation income at the time of exercise, and may refuse to honor the
exercise and refuse to deliver Shares if such withholding amounts are not
delivered at the time of exercise.
<PAGE>

                        (ii)    Incentive Stock Option. If this Option qualifies
                                ----------------------
as an ISO, the Optionee will have no regular federal income tax liability upon
its exercise, although the excess, if any, of the Fair Market Value of the
Exercised Shares on the date of exercise over their aggregate Exercise Price
will be treated as an adjustment to alternative minimum taxable income for
federal tax purposes and may subject the Optionee to alternative minimum tax in
the year of exercise. In the event that the Optionee ceases to be an Employee
but remains a Service Provider, any Incentive Stock Option of the Optionee that
remains unexercised shall cease to qualify as an Incentive Stock Option and will
be treated for tax purposes as a Nonstatutory Stock Option on the date three (3)
months and one (1) day following such change of status.

                (b)     Disposition of Shares.
                        ---------------------

                        (i)     NSO. If the Optionee holds NSO Shares for at
                                ---
least one year, any gain realized on disposition of the Shares will be treated
as long-term capital gain for federal income tax purposes.

                        (ii)    ISO. If the Optionee holds ISO Shares for at
                                ---
least one year after exercise and two years after the grant date, any gain
realized on disposition of the Shares will be treated as long-term capital gain
for federal income tax purposes. If the Optionee disposes of ISO Shares within
one year after exercise or two years after the grant date, any gain realized on
such disposition will be treated as compensation income (taxable at ordinary
income rates) to the extent of the excess, if any, of the lesser of (A) the
difference between the Fair Market Value of the Shares acquired on the date of
exercise and the aggregate Exercise Price, or (B) the difference between the
sale price of such Shares and the aggregate Exercise Price. Any additional gain
will be taxed as capital gain, short-term or long-term depending on the period
that the ISO Shares were held.

                (c)     Notice of Disqualifying Disposition of ISO Shares. If
                        -------------------------------------------------
the Optionee sells or otherwise disposes of any of the Shares acquired pursuant
to an ISO on or before the later of (i) two years after the grant date, or (ii)
one year after the exercise date, the Optionee shall immediately notify the
Company in writing of such disposition. The Optionee agrees that he or she may
be subject to income tax withholding by the Company on the compensation income
recognized from such early disposition of ISO Shares by payment in cash or out
of the current earnings paid to the Optionee.

        7       Entire Agreement; Governing Law. The Plan is incorporated herein
                -------------------------------
by reference. The Plan and this Option Agreement constitute the entire agreement
of the parties with respect to the subject matter hereof and supersede in their
entirety all prior undertakings and agreements of the Company and Optionee with
respect to the subject matter hereof, and may not be modified adversely to the
Optionee's interest except by means of a writing signed by the Company and
Optionee. This agreement is governed by the internal substantive laws, but not
the choice of law rules, of California.
<PAGE>

        8       NO GUARANTEE OF CONTINUED SERVICE. OPTIONEE ACKNOWLEDGES AND
                ---------------------------------
AGREES THAT THE VESTING OF SHARES PURSUANT TO THE VESTING SCHEDULE HEREOF IS
EARNED ONLY BY CONTINUING AS A SERVICE PROVIDER AT THE WILL OF THE COMPANY (AND
NOT THROUGH THE ACT OF BEING HIRED, BEING GRANTED AN OPTION OR PURCHASING SHARES
HEREUNDER). OPTIONEE FURTHER ACKNOWLEDGES AND AGREES THAT THIS AGREEMENT, THE
TRANSACTIONS CONTEMPLATED HEREUNDER AND THE VESTING SCHEDULE SET FORTH HEREIN DO
NOT CONSTITUTE AN EXPRESS OR IMPLIED PROMISE OF CONTINUED ENGAGEMENT AS A
SERVICE PROVIDER FOR THE VESTING PERIOD, FOR ANY PERIOD, OR AT ALL, AND SHALL
NOT INTERFERE WITH OPTIONEE'S RIGHT OR THE COMPANY'S RIGHT TO TERMINATE
OPTIONEE'S RELATIONSHIP AS A SERVICE PROVIDER AT ANY TIME, WITH OR WITHOUT
CAUSE.

        By your signature and the signature of the Company's representative
below, you and the Company agree that this Option is granted under and governed
by the terms and conditions of the Plan and this Option Agreement. Optionee has
reviewed the Plan and this Option Agreement in their entirety, has had an
opportunity to obtain the advice of counsel prior to executing this Option
Agreement and fully understands all provisions of the Plan and Option Agreement.
Optionee hereby agrees to accept as binding, conclusive and final all decisions
or interpretations of the Administrator upon any questions relating to the Plan
and Option Agreement. Optionee further agrees to notify the Company upon any
change in the residence address indicated below.


OPTIONEE:                               RAMBUS INC.


- ------------------------------          --------------------------------
Signature                               Geoff Tate, President


- ------------------------------
Print Name


- ------------------------------
Residence Address


- ------------------------------

<PAGE>

                                                                     Exhibit 4.6

                                  RAMBUS INC.
                      1999 NONSTATUTORY STOCK OPTION PLAN


        1.      Purposes of the Plan. The purposes of this Stock Plan are:
                --------------------

                .       to attract and retain the best available personnel for
                        positions of substantial responsibility,

                .       to provide additional incentive to Employees and
                        Consultants, and

                .       to promote the success of the Company's business.

        Options granted under the Plan will be Nonstatutory Stock Options.

        2.      Definitions. As used herein, the following definitions shall
                -----------
                apply:

                (a)     "Administrator" means the Board or any of its Committees
                         -------------
as shall be administering the Plan, in accordance with Section 4 of the Plan.

                (b)     "Applicable Laws" means the requirements relating to the
                         ---------------
administration of stock option plans under U. S. state corporate laws, U.S.
federal and state securities laws, the Code, any stock exchange or quotation
system on which the Common Stock is listed or quoted and the applicable laws of
any foreign country or jurisdiction where Options are, or will be, granted under
the Plan.

                (c)     "Board" means the Board of Directors of the Company.
                         -----

                (d)     "Code" means the Internal Revenue Code of 1986, as
                         ----
                        amended.

                (e)     "Committee" means a committee of Directors appointed by
                         ---------
the Board in accordance with Section 4 of the Plan.

                (f)     "Common Stock" means the common stock of the Company.
                         ------------

                (g)     "Company" means Rambus Inc., a Delaware corporation.
                         -------

                (h)     "Consultant" means any person, including an advisor,
                         ----------
engaged by the Company or a Parent or Subsidiary to render services to such
entity.

                (i)     "Director" means a member of the Board.
                         --------


                                      -1-
<PAGE>

                (j)     "Disability" means total and permanent disability as
                         ----------
defined in Section 22(e)(3) of the Code.

                (k)     "Employee" means any person, including Officers and
                         --------
Directors, employed by the Company or any Parent or Subsidiary of the Company. A
Service Provider shall not cease to be an Employee in the case of (i) any leave
of absence approved by the Company or (ii) transfers between locations of the
Company or between the Company, its Parent, any Subsidiary, or any successor.

                (l)     "Exchange Act" means the Securities Exchange Act of
                         ------------
1934, as amended.

                (m)     "Fair Market Value" means, as of any date, the value of
                         -----------------
Common Stock determined as follows:

                        (i)     If the Common Stock is listed on any established
stock exchange or a national market system, including without limitation the
Nasdaq National Market or The Nasdaq SmallCap Market of The Nasdaq Stock Market,
its Fair Market Value shall be the closing sales price for such stock (or the
closing bid, if no sales were reported) as quoted on such exchange or system for
the last market trading day prior to the time of determination, as reported in
The Wall Street Journal or such other source as the Administrator deems
reliable;

                        (ii)    If the Common Stock is regularly quoted by a
recognized securities dealer but selling prices are not reported, the Fair
Market Value of a Share of Common Stock shall be the mean between the high bid
and low asked prices for the Common Stock on the last market trading day prior
to the day of determination, as reported in The Wall Street Journal or such
other source as the Administrator deems reliable; or

                        (iii)   In the absence of an established market for the
Common Stock, the Fair Market Value shall be determined in good faith by the
Administrator.

                (n)     "Notice of Grant" means a written or electronic notice
                         ---------------
evidencing certain terms and conditions of an individual Option grant. The
Notice of Grant is part of the Option Agreement.

                (o)     "Officer" means a person who is an officer of the
                         -------
Company within the meaning of Section 16 of the Exchange Act and the rules and
regulations promulgated thereunder.

                (p)     "Option" means a nonstatutory stock option granted
                         ------
pursuant to the Plan, that is not intended to qualify as an incentive stock
option within the meaning of Section 422 of the Code and the regulations
promulgated thereunder.


                                      -2-
<PAGE>

                (q)     "Option Agreement" means an agreement between the
                         ----------------
Company and an Optionee evidencing the terms and conditions of an individual
Option grant. The Option Agreement is subject to the terms and conditions of the
Plan.

                (r)     "Option Exchange Program" means a program whereby
                         -----------------------
outstanding Options are surrendered in exchange for Options with a lower
exercise price.

                (s)     "Optioned Stock" means the Common Stock subject to an
                         --------------
Option.

                (t)     "Optionee" means the holder of an outstanding Option
                         --------
 granted under the Plan.

                (u)     "Parent" means a "parent corporation," whether now or
                         ------
hereafter existing, as defined in Section 424(e) of the Code.

                (v)     "Plan" means this 1999 Nonstatutory Stock Option Plan.
                         ----

                (w)     "Service Provider" means an Employee including an
                         ----------------
Officer, Director or Consultant.

                (x)     "Share" means a share of the Common Stock, as adjusted
                         -----
in accordance with Section 12 of the Plan.

                (y)     "Subsidiary" means a "subsidiary corporation", whether
                         ----------
now or hereafter existing, as defined in Section 424(f) of the Code.

        3.      Stock Subject to the Plan. Subject to the provisions of Section
                -------------------------
12 of the Plan, the maximum aggregate number of Shares which may be optioned and
sold under the Plan is 1,000,000 Shares. The Shares may be authorized, but
unissued, or reacquired Common Stock.

                If an Option expires or becomes unexercisable without having
been exercised in full, or is surrendered pursuant to an Option Exchange
Program, the unpurchased Shares which were subject thereto shall become
available for future grant or sale under the Plan (unless the Plan has
terminated); provided, however, that Shares that have actually been issued under
             --------
the Plan, upon exercise of an Option, shall not be returned to the Plan and
shall not become available for future distribution under the Plan.

        4.      Administration of the Plan.
                --------------------------

                (a)     Administration. The Plan shall be administered by (A)
                        --------------
the Board or (B) a Committee, which committee shall be constituted to satisfy
Applicable Laws.

                                      -3-
<PAGE>

                (b)     Powers of the Administrator. Subject to the provisions
                        ---------------------------
of the Plan, and in the case of a Committee, subject to the specific duties
delegated by the Board to such Committee, the Administrator shall have the
authority, in its discretion:

                        (i)     to determine the Fair Market Value;

                        (ii)    to select the Service Providers to whom Options
may be granted hereunder;

                        (iii)   to determine the number of shares of Common
Stock to be covered by each Option granted hereunder;

                        (iv)    to approve forms of agreement for use under the
Plan;

                        (v)     to determine the terms and conditions, not
inconsistent with the terms of the Plan, of any Option granted hereunder. Such
terms and conditions include, but are not limited to, the exercise price, the
time or times when Options may be exercised (which may be based on performance
criteria), any vesting acceleration or waiver of forfeiture restrictions, and
any restriction or limitation regarding any Option of the shares of Common Stock
relating thereto, based in each case on such factors as the Administrator, in
its sole discretion, shall determine;

                        (vi)    to reduce the exercise price of any Option to
the then current Fair Market Value if the Fair Market Value of the Common Stock
covered by such Option shall have declined since the date the Option was
granted;

                        (vii)   to institute an Option Exchange Program;

                        (viii)  to construe and interpret the terms of the Plan
and awards granted pursuant to the Plan;

                        (ix)    to prescribe, amend and rescind rules and
regulations relating to the Plan, including rules and regulations relating to
sub-plans established for the purpose of qualifying for preferred tax treatment
under foreign tax laws;

                        (x)     to modify or amend each Option (subject to
Section 14(b) of the Plan), including the discretionary authority to extend the
post-termination exercisability period of Options longer than is otherwise
provided for in the Plan;

                        (xi)    to allow Optionees to satisfy withholding tax
obligations by electing to have the Company withhold from the Shares to be
issued upon exercise of an Option that number of Shares having a Fair Market
Value equal to the amount required to be withheld. The Fair Market Value of the
Shares to be withheld shall be determined on the date that the amount of tax to
be withheld is to be determined. All elections by an Optionee to have Shares
withheld for this purpose

                                      -4-
<PAGE>

shall be made in such form and under such conditions as the Administrator may
deem necessary or advisable;

                        (xii)   to authorize any person to execute on behalf of
the Company any instrument required to effect the grant of an Option previously
granted by the Administrator;

                        (xiii)  to make all other determinations deemed
necessary or advisable for administering the Plan.

                (c)     Effect of Administrator's Decision. The Administrator's
                        ----------------------------------
decisions, determinations and interpretations shall be final and binding on all
Optionees and any other holders of Options.

        5.      Eligibility. Options may be granted to Service Providers;
                -----------
provided, however, that notwithstanding anything to the contrary contained in
the Plan, Options may not be granted to Officers and Directors.

        6.      Limitation. Neither the Plan nor any Option shall confer upon an
                ----------
Optionee any right with respect to continuing the Optionee's relationship as a
Service Provider with the Company, nor shall they interfere in any way with the
Optionee's right or the Company's right to terminate such relationship at any
time, with or without cause.

        7.      Term of Plan. The Plan shall become effective upon its adoption
                ------------
by the Board. It shall continue in effect for a term of ten (10) years unless
terminated earlier under Section 14 of the Plan.

        8.      Term of Option. The term of each Option shall be stated in the
                --------------
Option Agreement.

        9.      Option Exercise Price and Consideration.
                ---------------------------------------

                (a)     Exercise Price. The per share exercise price for the
                        --------------
Shares to be issued pursuant to exercise of an Option shall be determined by the
Administrator.

                (b)     Waiting Period and Exercise Dates. At the time an Option
                        ---------------------------------
is granted, the Administrator shall fix the period within which the Option may
be exercised and shall determine any conditions which must be satisfied before
the Option may be exercised.

                (c)     Form of Consideration. The Administrator shall determine
                        ---------------------
the acceptable form of consideration for exercising an Option, including the
method of payment. Such consideration may consist entirely of:

                        (i)     cash;

                        (ii)    check;


                                      -5-
<PAGE>

                        (iii)   promissory note;

                        (iv)    other Shares which (A) in the case of Shares
acquired upon exercise of an option, have been owned by the Optionee for more
than six months on the date of surrender, and (B) have a Fair Market Value on
the date of surrender equal to the aggregate exercise price of the Shares as to
which said Option shall be exercised;

                        (v)     consideration received by the Company under a
cashless exercise program implemented by the Company in connection with the
Plan;

                        (vi)    a reduction in the amount of any Company
liability to the Optionee, including any liability attributable to the
Optionee's participation in any Company-sponsored deferred compensation program
or arrangement;

                        (vii)   any combination of the foregoing methods of
payment; or

                        (viii)  such other consideration and method of payment
for the issuance of Shares to the extent permitted by Applicable Laws.

        10.     Exercise of Option.
                ------------------

                (a)     Procedure for Exercise; Rights as a Stockholder. Any
                        -----------------------------------------------
Option granted hereunder shall be exercisable according to the terms of the Plan
and at such times and under such conditions as determined by the Administrator
and set forth in the Option Agreement. Unless the Administrator provides
otherwise, vesting of Options granted hereunder shall be tolled during any
unpaid leave of absence. An Option may not be exercised for a fraction of a
Share.

                        An Option shall be deemed exercised when the Company
receives: (i) written or electronic notice of exercise (in accordance with the
Option Agreement) from the person entitled to exercise the Option, and (ii) full
payment for the Shares with respect to which the Option is exercised. Full
payment may consist of any consideration and method of payment authorized by the
Administrator and permitted by the Option Agreement and the Plan. Shares issued
upon exercise of an Option shall be issued in the name of the Optionee or, if
requested by the Optionee, in the name of the Optionee and his or her spouse.
Until the Shares are issued (as evidenced by the appropriate entry on the books
of the Company or of a duly authorized transfer agent of the Company), no right
to vote or receive dividends or any other rights as a stockholder shall exist
with respect to the Optioned Stock, notwithstanding the exercise of the Option.
The Company shall issue (or cause to be issued) such Shares promptly after the
Option is exercised. No adjustment will be made for a dividend or other right
for which the record date is prior to the date the Shares are issued, except as
provided in Section 12 of the Plan.

                                      -6-
<PAGE>

                        Exercising an Option in any manner shall decrease the
number of Shares thereafter available, both for purposes of the Plan and for
sale under the Option, by the number of Shares as to which the Option is
exercised.

                (b)     Termination of Relationship as a Service Provider. If an
                        -------------------------------------------------
Optionee ceases to be a Service Provider, other than upon the Optionee's death
or Disability, the Optionee may exercise his or her Option within such period of
time as is specified in the Option Agreement to the extent that the Option is
vested on the date of termination (but in no event later than the expiration of
the term of such Option as set forth in the Option Agreement). In the absence of
a specified time in the Option Agreement, the Option shall remain exercisable
for three (3) months following the Optionee's termination. If, on the date of
termination, the Optionee is not vested as to his or her entire Option, the
Shares covered by the unvested portion of the Option shall revert to the Plan.
If, after termination, the Optionee does not exercise his or her Option within
the time specified by the Administrator, the Option shall terminate, and the
Shares covered by such Option shall revert to the Plan.

                (c)     Disability of Optionee. If an Optionee ceases to be a
                        ----------------------
Service Provider as a result of the Optionee's Disability, the Optionee may
exercise his or her Option within such period of time as is specified in the
Option Agreement to the extent the Option is vested on the date of termination
(but in no event later than the expiration of the term of such Option as set
forth in the Option Agreement). In the absence of a specified time in the Option
Agreement, the Option shall remain exercisable for twelve (12) months following
the Optionee's termination. If, on the date of termination, the Optionee is not
vested as to his or her entire Option, the Shares covered by the unvested
portion of the Option shall revert to the Plan. If, after termination, the
Optionee does not exercise his or her Option within the time specified herein,
the Option shall terminate, and the Shares covered by such Option shall revert
to the Plan.

                (d)     Death of Optionee. If an Optionee dies while a Service
                        -----------------
Provider, the Option may be exercised within such period of time as is specified
in the Option Agreement (but in no event later than the expiration of the term
of such Option as set forth in the Notice of Grant), by the Optionee's estate or
by a person who acquires the right to exercise the Option by bequest or
inheritance, but only to the extent that the Option is vested on the date of
death. In the absence of a specified time in the Option Agreement, the Option
shall remain exercisable for twelve (12) months following the Optionee's
termination. If, at the time of death, the Optionee is not vested as to his or
her entire Option, the Shares covered by the unvested portion of the Option
shall immediately revert to the Plan. The Option may be exercised by the
executor or administrator of the Optionee's estate or, if none, by the person(s)
entitled to exercise the Option under the Optionee's will or the laws of descent
or distribution. If the Option is not so exercised within the time specified
herein, the Option shall terminate, and the Shares covered by such Option shall
revert to the Plan.


                                      -7-
<PAGE>

                (e)     Buyout Provisions. The Administrator may at any time
                        -----------------
offer to buy out for a payment in cash or Shares an Option previously granted
based on such terms and conditions as the Administrator shall establish and
communicate to the Optionee at the time that such offer is made.

        11.     Non-Transferability. Unless determined otherwise by the
                -------------------
Administrator, an Option may not be sold, pledged, assigned, hypothecated,
transferred, or disposed of in any manner other than by will or by the laws of
descent or distribution and may be exercised, during the lifetime of the
Optionee, only by the Optionee. If the Administrator makes an Option
transferable, such Option shall contain such additional terms and conditions as
the Administrator deems appropriate.

        12.     Adjustments Upon Changes in Capitalization, Dissolution, Merger
                ---------------------------------------------------------------
or Asset Sale.
- -------------

                (a)     Changes in Capitalization. Subject to any required
                        -------------------------
action by the stockholders of the Company, the number of shares of Common Stock
covered by each outstanding Option, and the number of shares of Common Stock
which have been authorized for issuance under the Plan but as to which no
Options have yet been granted or which have been returned to the Plan upon
cancellation or expiration of an Option, as well as the price per share of
Common Stock covered by each such outstanding Option, shall be proportionately
adjusted for any increase or decrease in the number of issued shares of Common
Stock resulting from a stock split, reverse stock split, stock dividend,
combination or reclassification of the Common Stock, or any other increase or
decrease in the number of issued shares of Common Stock effected without receipt
of consideration by the Company; provided, however, that conversion of any
convertible securities of the Company shall not be deemed to have been "effected
without receipt of consideration." Such adjustment shall be made by the Board,
whose determination in that respect shall be final, binding and conclusive.
Except as expressly provided herein, no issuance by the Company of shares of
stock of any class, or securities convertible into shares of stock of any class,
shall affect, and no adjustment by reason thereof shall be made with respect to,
the number or price of shares of Common Stock subject to an Option.

                (b)     Dissolution or Liquidation. In the event of the proposed
                        --------------------------
dissolution or liquidation of the Company, the Administrator shall notify each
Optionee as soon as practicable prior to the effective date of such proposed
transaction. The Administrator in its discretion may provide for an Optionee to
have the right to exercise his or her Option until ten (10) days prior to such
transaction as to all of the Optioned Stock covered thereby, including Shares as
to which the Option would not otherwise be exercisable. In addition, the
Administrator may provide that any Company repurchase option applicable to any
Shares purchased upon exercise of an Option shall lapse as to all such Shares,
provided the proposed dissolution or liquidation takes place at the time and in
the manner contemplated. To the extent it has not been previously exercised, an
Option will terminate immediately prior to the consummation of such proposed
action.

                (c)     Merger or Asset Sale. In the event of a merger of the
                        --------------------
Company with or into another corporation, or the sale of substantially all of
the assets of the Company (a "Merger"), each


                                      -8-
<PAGE>

outstanding Option shall be assumed or an equivalent option substituted by the
successor corporation or a Parent or Subsidiary of the successor corporation
(the "Successor Corporation").

                Following such assumption or substitution in connection with a
Merger, if the Optionee's status as an Employee or employee of the Successor
Corporation, as applicable, is terminated by the Successor Corporation as a
result of an Involuntary Termination (as defined below) other than for Cause (as
defined below) within twelve months following a Merger, the Optionee shall fully
vest in and have the right to exercise Optionee's Option as to all of the
Optioned Stock, including Shares as to which Optionee would not otherwise be
vested or exercisable. Thereafter, the Option shall remain exercisable in
accordance with Sections 10(b) through (d) above.

                For purposes of this section, any of the following events shall
constitute an "Involuntary Termination": (i) without the Employee's express
written consent, a significant reduction of the Employee's duties, authority or
responsibilities, relative to the Employee's duties, authority or
responsibilities as in effect immediately prior to the Merger, or the assignment
to Employee of such reduced duties, authority or responsibilities; (ii) without
the Employee's express written consent, a substantial reduction, without good
business reasons, of the facilities and perquisites (including office space and
location) available to the Employee immediately prior to the Merger; (iii) a
reduction by the Successor Corporation in the base salary of the Employee as in
effect immediately prior to the Merger; (iv) a material reduction by the
Successor Corporation in the kind or level of employee benefits, including
bonuses, to which the Employee was entitled immediately prior to the Merger with
the result that the Employee's overall benefits package is significantly
reduced; (v) the relocation of the Employee to a facility or a location more
than fifty (50) miles from the Employee's then present location, without the
Employee's express written consent; (vi) any purported termination of the
Employee by the Corporation which is not effected for Disability or for Cause,
or any purported termination for which the grounds relied upon are not valid;
(vii) or any act or set of facts or circumstances which would, under California
case law or statute constitute a constructive termination of the Employee.

                For purposes of this section, "Cause" shall mean (i) any act of
personal dishonesty taken by the Employee in connection with his
responsibilities as an employee and intended to result in substantial personal
enrichment of the Employee, (ii) the conviction of a felony, (iii) a willful act
by the Employee which constitutes gross misconduct and which is injurious to the
Successor Corporation, and (iv) following delivery to the Employee of a written
demand for performance from the Successor Corporation which describes the basis
for the Successor Corporation's belief that the Employee has not substantially
performed his duties, continued violations by the Employee of the Employee's
obligations to the Successor which are demonstrably willful and deliberate on
the Employee's part.

                In the event that the Successor Corporation refuses to assume or
substitute for the Option, the Optionee shall fully vest in and have the right
to exercise the Option as to all of the Optioned Stock, including Shares as to
which Optionee would not otherwise be vested or

                                      -9-
<PAGE>

exercisable. If an Option becomes fully vested and exercisable in lieu of
assumption or substitution in the event of a merger or sale of assets, the
Administrator shall notify the Optionee in writing or electronically that the
Option shall be fully vested and exercisable for a period of fifteen (15) days
from the date of such notice, and the Option shall terminate upon the expiration
of such period. For the purposes of this paragraph, the Option shall be
considered assumed if, following the merger or sale of assets, the option
confers the right to purchase or receive, for each Share of Optioned Stock
subject to the Option immediately prior to the merger or sale of assets, the
consideration (whether stock, cash, or other securities or property) received in
the merger or sale of assets by holders of Common Stock for each Share held on
the effective date of the transaction (and if holders were offered a choice of
consideration, the type of consideration chosen by the holders of a majority of
the outstanding Shares); provided, however, that if such consideration received
in the merger or sale of assets is not solely common stock of the Successor
Corporation or its Parent, the Administrator may, with the consent of the
Successor Corporation, provide for the consideration to be received upon the
exercise of the Option, for each Share of Optioned Stock subject to the Option,
to be solely common stock of the Successor Corporation or its Parent equal in
fair market value to the per share consideration received by holders of Common
Stock in the merger or sale of assets.

        13.     Date of Grant. The date of grant of an Option shall be, for all
                -------------
purposes, the date on which the Administrator makes the determination granting
such Option, or such other later date as is determined by the Administrator.
Notice of the determination shall be provided to each Optionee within a
reasonable time after the date of such grant.

        14.     Amendment and Termination of the Plan.
                -------------------------------------

                (a)     Amendment and Termination. The Board may at any time
                        -------------------------
amend, alter, suspend or terminate the Plan.

                (b)     Effect of Amendment or Termination. No amendment,
                        ----------------------------------
alteration, suspension or termination of the Plan shall impair the rights of any
Optionee, unless mutually agreed otherwise between the Optionee and the
Administrator, which agreement must be in writing and signed by the Optionee and
the Company. Termination of the Plan shall not affect the Administrator's
ability to exercise the powers granted to it hereunder with respect to Options
granted under the Plan prior to the date of such termination.

        15.     Conditions Upon Issuance of Shares.
                ----------------------------------

                (a)     Legal Compliance. Shares shall not be issued pursuant to
                        ----------------
the exercise of an Option unless the exercise of such Option and the issuance
and delivery of such Shares shall comply with Applicable Laws and shall be
further subject to the approval of counsel for the Company with respect to such
compliance.

                                      -10-
<PAGE>

                (b)     Investment Representations. As a condition to the
                        --------------------------
exercise of an Option, the Company may require the person exercising such Option
to represent and warrant at the time of any such exercise that the Shares are
being purchased only for investment and without any present intention to sell or
distribute such Shares if, in the opinion of counsel for the Company, such a
representation is required.

        16.     Inability to Obtain Authority. The inability of the Company to
                -----------------------------
obtain authority from any regulatory body having jurisdiction, which authority
is deemed by the Company's counsel to be necessary to the lawful issuance and
sale of any Shares hereunder, shall relieve the Company of any liability in
respect of the failure to issue or sell such Shares as to which such requisite
authority shall not have been obtained.

        17.     Reservation of Shares. The Company, during the term of this
                ---------------------
Plan, will at all times reserve and keep available such number of Shares as
shall be sufficient to satisfy the requirements of the Plan.

                                      -11-
<PAGE>

                       1999 NONSTATUTORY STOCK OPTION PLAN
                             STOCK OPTION AGREEMENT

        Unless otherwise defined herein, the terms defined in the Plan shall
have the same defined meanings in this Option Agreement.

I.  NOTICE OF STOCK OPTION GRANT
    ----------------------------

[Optionee's Name and Address]

        You have been granted an option to purchase Common Stock of the Company,
subject to the terms and conditions of the Plan and this Option Agreement, as
follows:

        Grant Number                        _________________________

        Date of Grant                       _________________________

        Vesting Commencement Date           _________________________

        Exercise Price per Share            $________________________

        Total Number of Shares Granted      _________________________

        Total Exercise Price                $_________________________

        Type of Option:                     Nonstatutory Stock Option

        Term/Expiration Date:               _________________________

     Vesting Schedule:
     -----------------

        This Option may be exercised, in whole or in part, in accordance with
the following schedule:

        12.5% of the Shares subject to the Option shall vest six months after
the date of grant, and 1/48 of the Shares subject to the Option shall vest each
month thereafter so that 100% of the Shares subject to the Option shall be
vested four (4) years from the grant date, subject to the Optionee remaining a
Service Provider as of such vesting dates.

        Termination Period:
        -------------------

        This Option may be exercised for three months after Optionee ceases to
be a Service Provider. Upon the death or Disability of the Optionee, this Option
may be exercised for such longer period as provided in the Plan. In no event
shall this Option be exercised later than the Term/Expiration Date as provided
above.
<PAGE>

II.  AGREEMENT
     ---------

        1       Grant of Option. The Plan Administrator of the Company hereby
                ---------------
grants to the Optionee named in the Notice of Grant attached as Part I of this
Agreement (the "Optionee") an option (the "Option") to purchase the number of
Shares, as set forth in the Notice of Grant, at the exercise price per share set
forth in the Notice of Grant (the "Exercise Price"), subject to the terms and
conditions of the Plan, which is incorporated herein by reference. Subject to
Section 14(b) of the Plan, in the event of a conflict between the terms and
conditions of the Plan and the terms and conditions of this Option Agreement,
the terms and conditions of the Plan shall prevail.

        2       Exercise of Option.
                ------------------

                (a) Right to Exercise. This Option is exercisable during its
                    -----------------
term in accordance with the Vesting Schedule set out in the Notice of Grant and
the applicable provisions of the Plan and this Option Agreement.

                (b) Method of Exercise. This Option is exercisable by delivery
                    ------------------
of an exercise notice, in the form attached as Exhibit A (the "Exercise
Notice"), which shall state the election to exercise the Option, the number of
Shares in respect of which the Option is being exercised (the "Exercised
Shares"), and such other representations and agreements as may be required by
the Company pursuant to the provisions of the Plan. The Exercise Notice shall be
completed by the Optionee and delivered to [Title] of the Company. The Exercise
Notice shall be accompanied by payment of the aggregate Exercise Price as to all
Exercised Shares. This Option shall be deemed to be exercised upon receipt by
the Company of such fully executed Exercise Notice accompanied by such aggregate
Exercise Price.

                No Shares shall be issued pursuant to the exercise of this
Option unless such issuance and exercise complies with Applicable Laws. Assuming
such compliance, for income tax purposes the Exercised Shares shall be
considered transferred to the Optionee on the date the Option is exercised with
respect to such Exercised Shares.

        3       Method of Payment. Payment of the aggregate Exercise Price shall
                -----------------
be by any of the following, or a combination thereof, at the election of the
Optionee:

                (a) cash;

                (b) check;

                (c) consideration received by the Company under a cashless
exercise program implemented by the Company in connection with the Plan; or

                                      -2-
<PAGE>

          (d) surrender of other Shares which (i) in the case of Shares acquired
upon exercise of an option, have been owned by the Optionee for more than six
(6) months on the date of surrender, and (ii) have a Fair Market Value on the
date of surrender equal to the aggregate Exercise Price of the Exercised Shares;
or

          (e) with the Administrator's consent, delivery of Optionee's
promissory note (the "Note") in the form attached hereto as Exhibit C, in the
amount of the aggregate Exercise Price of the Exercised Shares together with the
execution and delivery by the Optionee of the Security Agreement attached hereto
as Exhibit B. The Note shall bear interest at the "applicable federal rate"
prescribed under the Code and its regulations at time of purchase, and shall be
secured by a pledge of the Shares purchased by the Note pursuant to the Security
Agreement.

        4 Non-Transferability of Option. This Option may not be transferred in
          -----------------------------
any manner otherwise than by will or by the laws of descent or distribution and
may be exercised during the lifetime of Optionee only by the Optionee. The terms
of the Plan and this Option Agreement shall be binding upon the executors,
administrators, heirs, successors and assigns of the Optionee.

        5 Term of Option. This Option may be exercised only within the term set
          --------------
out in the Notice of Grant, and may be exercised during such term only in
accordance with the Plan and the terms of this Option Agreement.

        6 Tax Consequences. Some of the federal tax consequences relating to
          ----------------
this Option, as of the date of this Option, are set forth below. THIS SUMMARY IS
NECESSARILY INCOMPLETE, AND THE TAX LAWS AND REGULATIONS ARE SUBJECT TO CHANGE.
THE OPTIONEE SHOULD CONSULT A TAX ADVISER BEFORE EXERCISING THIS OPTION OR
DISPOSING OF THE SHARES.

          (a) Exercising the Option. The Optionee may incur regular federal
              ---------------------
income tax liability upon exercise of a NSO. The Optionee will be treated as
having received compensation income (taxable at ordinary income tax rates) equal
to the excess, if any, of the Fair Market Value of the Exercised Shares on the
date of exercise over their aggregate Exercise Price. If the Optionee is an
Employee or a former Employee, the Company will be required to withhold from his
or her compensation or collect from Optionee and pay to the applicable taxing
authorities an amount in cash equal to a percentage of this compensation income
at the time of exercise, and may refuse to honor the exercise and refuse to
deliver Shares if such withholding amounts are not delivered at the time of
exercise.

          (b) Disposition of Shares. If the Optionee holds NSO Shares for at
              ---------------------
least one year, any gain realized on disposition of the Shares will be treated
as long-term capital gain for federal income tax purposes.

                                      -3-
<PAGE>

        7 Entire Agreement; Governing Law. The Plan is incorporated herein by
          -------------------------------
reference. The Plan and this Option Agreement constitute the entire agreement of
the parties with respect to the subject matter hereof and supersede in their
entirety all prior undertakings and agreements of the Company and Optionee with
respect to the subject matter hereof, and may not be modified adversely to the
Optionee's interest except by means of a writing signed by the Company and
Optionee. This agreement is governed by the internal substantive laws, but not
the choice of law rules, of California.

        8 NO GUARANTEE OF CONTINUED SERVICE. OPTIONEE ACKNOWLEDGES AND AGREES
          ---------------------------------
THAT THE VESTING OF SHARES PURSUANT TO THE VESTING SCHEDULE HEREOF IS EARNED
ONLY BY CONTINUING AS A SERVICE PROVIDER AT THE WILL OF THE COMPANY (AND NOT
THROUGH THE ACT OF BEING HIRED, BEING GRANTED AN OPTION OR PURCHASING SHARES
HEREUNDER). OPTIONEE FURTHER ACKNOWLEDGES AND AGREES THAT THIS AGREEMENT, THE
TRANSACTIONS CONTEMPLATED HEREUNDER AND THE VESTING SCHEDULE SET FORTH HEREIN DO
NOT CONSTITUTE AN EXPRESS OR IMPLIED PROMISE OF CONTINUED ENGAGEMENT AS A
SERVICE PROVIDER FOR THE VESTING PERIOD, FOR ANY PERIOD, OR AT ALL, AND SHALL
NOT INTERFERE WITH OPTIONEE'S RIGHT OR THE COMPANY'S RIGHT TO TERMINATE
OPTIONEE'S RELATIONSHIP AS A SERVICE PROVIDER AT ANY TIME, WITH OR WITHOUT
CAUSE.

        By your signature and the signature of the Company's representative
below, you and the Company agree that this Option is granted under and governed
by the terms and conditions of the Plan and this Option Agreement. Optionee has
reviewed the Plan and this Option Agreement in their entirety, has had an
opportunity to obtain the advice of counsel prior to executing this Option
Agreement and fully understands all provisions of the Plan and Option Agreement.
Optionee hereby agrees to accept as binding, conclusive and final all decisions
or interpretations of the Administrator upon any questions relating to the Plan
and Option Agreement. Optionee further agrees to notify the Company upon any
change in the residence address indicated below.


OPTIONEE:                               RAMBUS INC.

- --------------------------------        --------------------------------------
Signature                               By

- --------------------------------        --------------------------------------
Print Name                              Title

- --------------------------------
Residence Address

- --------------------------------

                                      -4-
<PAGE>

                                    EXHIBIT A
                                    ---------

                       1999 NONSTATUTORY STOCK OPTION PLAN

                                 EXERCISE NOTICE

Rambus Inc.
2465 Latham Drive
Mountain View, CA 94040


Attention:     Secretary


        1. Exercise of Option. Effective as of today, ________________, 199__,
the undersigned ("Purchaser") hereby elects to purchase ______________ shares
(the "Shares") of the Common Stock of Rambus Inc. (the "Company") under and
pursuant to the 1999 Nonstatutory Stock Option Plan (the "Plan") and the Stock
Option Agreement dated _______________, 19___ (the "Option Agreement"). The
purchase price for the Shares shall be $_______________, as required by the
Option Agreement.

        2. Delivery of Payment. Purchaser herewith delivers to the Company the
           -------------------
full purchase price for the Shares.

        3. Representations of Purchaser. Purchaser acknowledges that Purchaser
           ----------------------------
has received, read and understood the Plan and the Option Agreement and agrees
to abide by and be bound by their terms and conditions.

        4. Rights as Stockholder. Until the issuance (as evidenced by the
           ---------------------
appropriate entry on the books of the Company or of a duly authorized transfer
agent of the Company) of the Shares, no right to vote or receive dividends or
any other rights as a stockholder shall exist with respect to the Optioned
Stock, notwithstanding the exercise of the Option. The Shares so acquired shall
be issued to the Optionee as soon as practicable after exercise of the Option.
No adjustment will be made for a dividend or other right for which the record
date is prior to the date of issuance, except as provided in Section 12 of the
Plan.

        5. Tax Consultation. Purchaser understands that Purchaser may suffer
           ----------------
adverse tax consequences as a result of Purchaser's purchase or disposition of
the Shares. Purchaser represents that Purchaser has consulted with any tax
consultants Purchaser deems advisable in connection with the purchase or
disposition of the Shares and that Purchaser is not relying on the Company for
any tax advice.

                                      -5-
<PAGE>

        6. Entire Agreement; Governing Law. The Plan and Option Agreement are
           -------------------------------
incorporated herein by reference. This Agreement, the Plan and the Option
Agreement constitute the entire agreement of the parties with respect to the
subject matter hereof and supersede in their entirety all prior undertakings and
agreements of the Company and Purchaser with respect to the subject matter
hereof, and may not be modified adversely to the Purchaser's interest except by
means of a writing signed by the Company and Purchaser. This agreement is
governed by the internal substantive laws, but not the choice of law rules, of
California.


Submitted by:                               Accepted by:

PURCHASER:                                  RAMBUS INC.


- ----------------------------------          -----------------------------------
Signature                                   By

- ----------------------------------          -----------------------------------
Print Name                                  Title


Address:                                    Address:
- -------                                     -------

- ----------------------------------          Rambus Inc.
                                            2465 Latham Drive
- ----------------------------------          Mountain View, CA 94040


                                            -----------------------------------
                                            Date Received

<PAGE>

                                                                     Exhibit 5.1


                                December 22, 1999

Rambus Inc.
2465 Latham Street
Mountain View, California  94040

         Re:  Registration Statement on Form S-8

Ladies and Gentlemen:

         We have examined the Registration Statement on Form S-8 (the
"Registration Statement") to be filed by Rambus Inc., a Delaware corporation
(the "Registrant" or "you"), with the Securities and Exchange Commission on or
about December 22, 1999, in connection with the registration under the
Securities Act of 1933, as amended, of an aggregate of 2,128,840 shares of your
Common Stock, $0.001 par value (the "Shares"), reserved for issuance pursuant to
the 1997 Stock Plan, the 1997 Employee Stock Purchase Plan and the 1999
Nonstatutory Stock Option Plan (collectively, the "Plans"). As your legal
counsel, we have reviewed the actions proposed to be taken by you in connection
with the proposed sale and issuance of the Shares by the Registrant under the
Plans. We assume that the consideration received by you in connection with each
issuance of Shares will include an amount in the form of cash, services rendered
or property that exceeds the greater of (i) the aggregate par value of such
Shares or (ii) the portion of such consideration determined by the Company's
Board of Directors to be "capital" for purposes of the Delaware General
Corporation Law.

         It is our opinion that, upon completion of the proceedings being taken,
or contemplated by us, as your counsel, to be taken prior to the issuance of the
Shares pursuant to the Registration Statement and the Plans, including the
proceedings being taken in order to permit such transaction to be carried out in
accordance with applicable state securities laws, the Shares, when issued and
sold in the manner described in the Registration Statement and in accordance
with the resolutions adopted by the Board of Directors of the Company, will be
legally and validly issued, fully paid and nonassessable.

         We consent to the use of this opinion as an exhibit to the Registration
Statement, and further consent to the use of our name wherever appearing in the
Registration Statement and any amendments thereto.

                                        Very truly yours,

                                        WILSON SONSINI GOODRICH & ROSATI
                                        Professional Corporation

                                        /s/ WILSON SONSINI GOODRICH & ROSATI

<PAGE>

                                                                    EXHIBIT 23.1

                      Consent of Independent Accountants


We hereby consent to the incorporation by reference in this Registration
Statement on Form S-8 of our report dated October 14, 1998 relating to the
financial statements which appears in the Rambus, Inc.'s Annual Report on Form
10-K for the year ended September 30, 1998. We also consent to the
incorporation by reference of our report dated October 14, 1998 relating to
the financial statement schedule, which appears in such Annual Report on Form
10-K.


/s/ PricewaterhouseCoopers LLP
- ---------------------------------
PricewaterhouseCoopers LLP

San Jose, California
December 20, 1999


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