OPTI INC
SC 13D/A, 2000-11-27
SEMICONDUCTORS & RELATED DEVICES
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

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

                                  SCHEDULE 13D
                                 (Rule 13d-101)

             INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT
            TO RULE 13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO
                                  RULE 13d-2(a)

                              (Amendment No. 8 )(1)

                                   OPTI, Inc.
--------------------------------------------------------------------------------
                                (Name of Issuer)

                          Common Stock, $0.01 par value
--------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                    683960108
--------------------------------------------------------------------------------
                                 (CUSIP Number)

                            Scott B. Bernstein, Esq.,
                               Caxton Corporation,
                              315 Enterprise Drive
                          Plainsboro, New Jersey 08536
                                 (609) 936-2580
--------------------------------------------------------------------------------
  (Name, Address and Telephone Number of Person Authorized to Receive Notices
                              and Communications)

                                November 17, 2000
--------------------------------------------------------------------------------
             (Date of Event which Requires Filing of this Statement)

      If the filing person has previously filed a statement on Schedule 13G to
report the acquisition that is the subject of this Schedule 13D, and is filing
this schedule because of Rule 13d-1(e), 13d-1(f) or 13d-1(g), check the
following box |_|.

            Note. Schedules filed in paper format shall include a signed
      original and five copies of the schedule, including all exhibits. See Rule
      13d-7(b) for other parties to whom copies are to be sent.

                         (Continued on following pages)

                               (Page 1 of 9 Pages)

----------

      (1) The remainder of this cover page shall be filled out for a reporting
person's initial filing on this form with respect to the subject class of
securities, and for any subsequent amendment containing information which would
alter disclosures provided in a prior cover page.

      The information required on the remainder of this cover page shall not be
deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934 ("Act") or otherwise subject to the liabilities of that section of
the Act but shall be subject to all other provisions of the Act (however, see
the Notes).

<PAGE>

CUSIP No. 683960108               SCHEDULE 13D                 Page 2 of 9 Pages
--------------------------------------------------------------------------------
1     NAMES OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      Caxton International Limited
--------------------------------------------------------------------------------
2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                        (a)  |_|
                                                                        (b)  |_|
--------------------------------------------------------------------------------
3     SEC USE ONLY


--------------------------------------------------------------------------------
4     SOURCE OF FUNDS*

      WC
--------------------------------------------------------------------------------
5     CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
      TO ITEM 2(d) or 2(e)                                                   |_|

--------------------------------------------------------------------------------
6     CITIZENSHIP OR PLACE OF ORGANIZATION

      British Virgin Islands
--------------------------------------------------------------------------------
                  7     SOLE VOTING POWER

                        0
                        --------------------------------------------------------
  NUMBER OF       8     SHARED VOTING POWER
   SHARES
BENEFICIALLY            941,100
  OWNED BY              --------------------------------------------------------
    EACH          9     SOLE DISPOSITIVE POWER
  REPORTING
   PERSON               0
    WITH                --------------------------------------------------------
                  10    SHARED DISPOSITIVE POWER

                        941,100
--------------------------------------------------------------------------------
11    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      941,100
--------------------------------------------------------------------------------
12    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
      CERTAIN SHARES*                                                        |_|


--------------------------------------------------------------------------------
13    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

      8.1%%
--------------------------------------------------------------------------------
14    TYPE OF REPORTING PERSON*

      CO
--------------------------------------------------------------------------------

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!

<PAGE>

CUSIP No. 683960108               SCHEDULE 13D                 Page 3 of 9 Pages
--------------------------------------------------------------------------------
1     NAMES OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      Caxton Associates, L.L.C. 22-3430173
--------------------------------------------------------------------------------
2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                        (a)  |_|
                                                                        (b)  |_|
--------------------------------------------------------------------------------
3     SEC USE ONLY


--------------------------------------------------------------------------------
4     SOURCE OF FUNDS*

      Not Applicable
--------------------------------------------------------------------------------
5     CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
      TO ITEM 2(d) or 2(e)                                                   |_|

--------------------------------------------------------------------------------
6     CITIZENSHIP OR PLACE OF ORGANIZATION

      United States
--------------------------------------------------------------------------------
                  7     SOLE VOTING POWER

                        0
                        --------------------------------------------------------
  NUMBER OF       8     SHARED VOTING POWER
   SHARES
BENEFICIALLY            941,100
  OWNED BY              --------------------------------------------------------
    EACH          9     SOLE DISPOSITIVE POWER
  REPORTING
   PERSON               0
    WITH                --------------------------------------------------------
                  10    SHARED DISPOSITIVE POWER

                        941,100
--------------------------------------------------------------------------------
11    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      941,100
--------------------------------------------------------------------------------
12    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
      CERTAIN SHARES*                                                        |_|


--------------------------------------------------------------------------------
13    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

      8.1%
--------------------------------------------------------------------------------
14    TYPE OF REPORTING PERSON*

      OO
--------------------------------------------------------------------------------

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!

<PAGE>

CUSIP No. 683960108               SCHEDULE 13D                 Page 4 of 9 Pages
--------------------------------------------------------------------------------
1     NAMES OF REPORTING PERSONS
      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

      Bruce S. Kovner
--------------------------------------------------------------------------------
2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                        (a)  |_|
                                                                        (b)  |_|
--------------------------------------------------------------------------------
3     SEC USE ONLY


--------------------------------------------------------------------------------
4     SOURCE OF FUNDS*

      Not Applicable
--------------------------------------------------------------------------------
5     CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
      TO ITEM 2(d) or 2(e)                                                   |_|

--------------------------------------------------------------------------------
6     CITIZENSHIP OR PLACE OF ORGANIZATION

      United States
--------------------------------------------------------------------------------
                  7     SOLE VOTING POWER

                        0
                        --------------------------------------------------------
  NUMBER OF       8     SHARED VOTING POWER
   SHARES
BENEFICIALLY            941,100
  OWNED BY              --------------------------------------------------------
    EACH          9     SOLE DISPOSITIVE POWER
  REPORTING
   PERSON               0
    WITH                --------------------------------------------------------
                  10    SHARED DISPOSITIVE POWER

                        941,100
--------------------------------------------------------------------------------
11    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      941,100
--------------------------------------------------------------------------------
12    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
      CERTAIN SHARES*                                                        |_|


--------------------------------------------------------------------------------
13    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

      8.1%
--------------------------------------------------------------------------------
14    TYPE OF REPORTING PERSON*

      IN
--------------------------------------------------------------------------------

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!

<PAGE>

      This Amendment 8 to Schedule 13D relates to the Common Stock, par value
$.01 per share (the "Common Stock"), of OPTi, Inc., a California corporation
(the "Company"), 888 Tasman Drive, Milpitas, CA 95035.

Item 3: Source and Amount of Fund or Other Consideration.

      Item 3 of the Schedule 13D is hereby amended and supplemented by inserting
the following paragraphs at the end thereof:

      "A net aggregate of $728,452.73 (excluding commissions, if any) was paid
in a series of transactions pursuant to which Caxton International Limited
acquired and sold shares (of Common Stock) since October 21, 2000. The purchase
price for such acquired shares was paid out of Caxton International Limited's's
working capital.

Item 5: Interest in Securities of the Issuer.

      Subparagraph (a) of Item 5 of the Schedule 13D is hereby amended and
replaced by the following:

      "(i) Caxton International Limited beneficially owns 941,100 shares of
Common Stock (the "Shares"), approximately 8.1% of the total shares of Common
Stock issued and outstanding. This percentage reflects the acquisition of the
additional Shares and sale of Shares being reported hereunder.

      Subparagraph (c) of Item 5 of the Schedule 13D is hereby amended and
supplemented by adding the following paragraph at the end thereof:

      "Caxton International Limited acquired additional shares of Common Stock
in a series of open market transactions effected primarily with independent
brokers and, to a lesser extent, directly with market makers utilizing the
NASDAQ System, between October 21, 2000 and November 17, 2000. See Schedule A
for disclosure of (1) the date, (2) the price and (3) the amount of shares
purchased by Caxton International Limited, since October 21, 2000."

<PAGE>

      After reasonable inquiry and to the best of the undersigned's knowledge
and belief, the undersigned certify that the information set forth in this
statement is true, complete and correct.

      November 22, 2000                CAXTON INTERNATIONAL LIMITED


                                       By: /s/ Joseph Kelly
                                           -------------------------------------
                                           Name:  Joseph Kelly
                                           Title: Vice President and Treasurer


                                       By: /s/ Maxwell Quin
                                           -------------------------------------
                                           Name:  Maxwell Quin
                                           Title: Secretary


                                       CAXTON ASSOCIATES, L.L.C.


                                       By: /s/ Scott B. Bernstein
                                           -------------------------------------
                                           Name:  Scott B. Bernstein
                                           Title: Secretary


                                       /s/ Bruce S. Kovner
                                       -----------------------------------------
                                       Bruce S. Kovner, by Scott B. Bernstein,
                                       as Attorney-in-Fact

<PAGE>

                                                                      Schedule A

                Caxton International Limited

                            No of Shares                      Price per Share
Trade Date                   Purchased                    (Excluding Commission)

10/23/00                      2,600                                6.0000
10/25/00                      2,600                                5.8005
10/26/00                      9,900                                5.6875
10/27/00                      1,500                                5.7500
10/30/00                        600                                5.7500
10/31/00                     21,000                                5.9192
 11/1/00                     20,000                                5.9375
 11/2/00                      5,000                                6.1875
 11/3/00                      1,000                                5.9375
 11/6/00                      6,300                                6.2341
 11/7/00                     30,500                                5.9549
11/13/00                      2,000                                5.0625
11/14/00                      5,000                                5.1875
11/16/00                     10,000                                5.8125
11/17/00                      6,000                                5.7292

<PAGE>

                                  Exhibit Index

Exhibit 1 - Joint Acquisition Statement Pursuant To Rule 13d-1(k)(1).



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