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                       SECURITIES AND EXCHANGE COMMISSION
                              Washington, DC 20549

                                    FORM 6-K

                            REPORT OF FOREIGN ISSUER
                      PURSUANT TO RULE 13a-16 OR 15d-16 OF
                       THE SECURITIES EXCHANGE ACT OF 1934


                      For the month of         March, 2005
                                              ----------------
                      Commission File Number   000-29872
                                              ----------------


                              ATI TECHNOLOGIES INC.
                      -------------------------------------
                 (Translation of Registrant's Name into English)


         1 Commerce Valley Drive East, Markham, Ontario, Canada L3T 7X6
                      -------------------------------------
                    (Address of Principal Executive Offices)


     Indicate by check mark whether the registrant files or will file annual
reports under cover of Form 20-F or Form 40-F.

                  Form 20-F                          Form 40-F         X
                            ----------------                   -----------------


     Indicate by check mark whether the registrant by furnishing the
information contained in this Form is also thereby furnishing the information to
the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of
1934.

                  Yes                                No       X
                      --------------                    ---------------


                               Page 1 of 18 Pages
                           Index is located on Page 2








                                                                         2 of 18



                                      INDEX





Document                                                    Page Number
- --------                                                    -----------

                                                          
Press Release dated March 29, 2005                               3

Settlement Agreement dated March 28, 2005 between
ATI Technologies Inc. and the Ontario Securities Commission      5

Signature Page                                                  18








                                                                       3 of 18

[ATI Technologies Inc. LOGO]


For more information, please contact:
Chris Evenden, Director, Public Relations
905-882-2629 or cevenden@ati.com
                ----------------


                          ATI and OSC Reach Settlement

MARKHAM, ON - March 29, 2005, Toronto - A panel of the Ontario Securities
Commission (OSC) has approved a settlement agreement between Staff of the
Commission and ATI Technologies Inc. relating to allegations that in 2000 the
company did not make timely disclosure of a shortfall in earnings and made a
misleading statement to staff of the OSC in the context of an investigation by
Staff.

Terms of the settlement include an agreement for ATI to pay CDN $900,000 in
costs and settlement payments. ATI also agreed to provide a letter of comfort
confirming its practices and procedures related to trading and corporate
governance.

Today the company said in a statement:

"Settlement with the OSC is in the best interests of the company, our employees
and our shareholders. We are pleased to put the matter behind us and to continue
to focus on company operations.

We continue to place trust and confidence in K.Y. Ho, the Chairman of the
company and one of its founders, who is respected in the industry and the
company for his personal integrity and as a pioneer of the PC graphics industry.

                                                                           ..2




                                                                    Page 4 of 18

Good corporate governance is important to the company. The latest evaluation by
the Globe and Mail's Report on Business Survey of Companies on corporate
governance placed ATI in the top half of Canadian companies. The company has
also won awards from IR Magazine, including the Grand Prix for the best overall
investor relations in 2004 as voted on by the investment community."

Full details of the settlement are available on the OSC website:
www.osc.gov.on.ca.
- -----------------

About ATI Technologies

ATI Technologies Inc. is the world leader in the design and manufacture of
innovative 3D graphics and digital media silicon solutions. An industry pioneer
since 1985, ATI is the world's foremost graphics processing unit (GPU) provider
and is dedicated to delivering leading-edge performance solutions for the full
range of PC and Mac desktop and notebook platforms, workstation, set-top and
digital television, game console and handheld device markets. With 2004 revenues
of US $2 billion, ATI has more than 2,700 employees in the Americas, Europe and
Asia. ATI common shares trade on NASDAQ (ATYT) and the Toronto Stock Exchange
(ATY).
                                     - 30 -

Copyright 2005 ATI Technologies Inc. All rights reserved. ATI and ATI product
and product feature names are trademarks and/or registered trademarks of ATI
Technologies Inc. All other company and product names are trademarks and/or
registered trademarks of their respective owners. Features, pricing,
availability and specifications are subject to change without notice.

For media or industry analyst support, visit our Web site at http://www.ati.com
                                                             ------------------

Other ATI Contacts:
Trevor Campbell, Director, Porter Novelli Canada, at (416) 422-7202
trevor.campbell@porternovelli.com


For investor relations support, please contact:
Janet Craig, Director, Investor Relations,
ATI Technologies Inc., at (905) 882-2600, Ext. 2631 or
janet@ati.com




                                                                    Page 5 of 18



                      IN THE MATTER OF THE SECURITIES ACT,
                        R.S.O. 1990, C. s. 5, AS AMENDED

                                     -and-

                     IN THE MATTER OF ATI TECHNOLOGIES INC.


                              SETTLEMENT AGREEMENT


I.   INTRODUCTION

1.   By Notice of Hearing dated  January 16, 2003 (the  "Notice of  Hearing"),
     the Ontario  Securities  Commission  (the  "Commission")  announced that it
     proposed to hold a hearing to consider  whether,  pursuant to s. 127 and s.
     127.1(1) and (2) of the  Securities  Act,  R.S.O.  1990, c. S.5, as amended
     (the "Act"), it is in the public interest to make an Order that:

     (a)  ATI Technologies Inc. ("ATI") be reprimanded;

     (b)  That exemptions contained in Ontario securities law, particularly Rule
          45-503, part 3, section 3.1, that exempts trades by a listed issuer of
          its own  securities to executives  not apply to ATI for such period as
          is specified in the Order;

     (c)  That ATI submit to a review of its practices and procedures; and

     (d)  ATI be ordered to pay a portion of the costs  incurred by or on behalf
          of the Commission  relating to the investigation and hearing into this
          matter.




                                                                    Page 6 of 18





II.  JOINT SETTLEMENT RECOMMENDATION

2.   Staff  recommend  settlement of the proceeding  initiated in respect of the
     respondent,  ATI, by the Notice of Hearing in accordance with the terms and
     conditions set out below.  ATI agrees to the settlement on the basis of the
     facts  agreed to as provided  in Part III and  consents to the making of an
     Order in the form  attached as  Schedule  "A" on the basis of the facts set
     out below.


III. FACTS

Acknowledgement

3.   Solely for the  purposes  of this  agreement,  for the  settlement  of this
     matter and as a basis for the undertakings  contained herein, Staff and ATI
     agree with the facts and  conclusions set out in Part III of the Settlement
     Agreement.

4.   Staff and ATI agree this agreement is without prejudice to either of ATI or
     Staff in any other  proceeding of any kind including,  but without limiting
     the generality of the foregoing,  any proceedings brought by the Commission
     under the Act or any civil or other proceedings which may be brought by any
     other person or agency. It is also agreed that this Agreement and the facts
     in it are  without  prejudice  to and cannot be raised or relied on in this
     proceeding  as between Staff and any other  Respondent  not a party to this
     Agreement.

Background

5.   ATI Technologies Inc. designs, manufactures and markets video, graphics and
     multi-media  hardware  and  software  products  for the  desktop and mobile
     personal  computer  markets.  It was  incorporated in 1985. Its shares were
     listed and posted for trading on the Toronto Stock Exchange on November 29,
     1993.

6.   Jo-Anne Chang was the Director of Investor Relations at ATI.




                                                                    Page 7 of 18


Allegations


7.   The specific allegations advanced by Staff are:

     (a)  That ATI failed to disclose material information forthwith contrary to
          s. 408 of the TSX  Company  Manual and thereby  acted  contrary to the
          public  interest.  The material  information was that ATI would report
          lower than expected revenue and earnings for Q3-2000.

     (b)  That ATI made a statement to Staff of the Commission during the course
          of its  investigation  of ATI that,  in a material  respect and at the
          time and in light of the  circumstances  in which  the  statement  was
          made,  was  misleading  or  untrue  or did not  state a fact  that was
          required to be stated or that was  necessary to make the statement not
          misleading.  In  particular,  ATI made the statement that the earliest
          material meetings, communications,  events and developments leading up
          to the disclosure on May 24, 2000 occurred on May 16, 2000.

ATI's Failure to Disclose Forthwith

(i)  ATI's public profile

8.   On January 13, 2000, ATI issued a news release and announced "first quarter
     sets revenue record."

9.   Later that day, ATI  management  held a conference  call with  analysts and
     stated it expected 25% year over year revenue  growth and gross  margins in
     the "low 30s" for fiscal 2000.

10.  On April 6, 2000, ATI management  held a conference  call with analysts and
     repeated its guidance that it expected 20-25% year over year revenue growth
     and gross margins in the "low 30s" for the balance of the year.




                                                                    Page 8 of 18



(ii) An Unexpected Announcement

11.  Prior to the  opening of trading on May 24,  2000,  ATI  released  an early
     warning  news release that it expected a loss of .06 cents to .07 cents per
     share for Q3-2000.  ATI filed a material  change report with the Commission
     on May 25, 2000.  The Company  cited  component  shortages  and  aggressive
     pricing from competitors as the reasons for the adverse results.

12.  Following the  announcement on May 24, 2000,  ATI's share price fell by 42%
     from $25.45 to $14.75.  On May 25, 2000, the price fell further to close at
     $12.10 for a two day loss of 53% from $25.45 to $12.10.


(iii) ATI's Q3 2000

13.  ATI's Operating Plan for fiscal 2000 had highlighted various  opportunities
     and  concerns for fiscal 2000,  including  risks that might,  but would not
     necessarily,  materialize or affect  anticipated  results  regarding market
     share,  competition,  higher  costs,  lack  of a  competitive  product  and
     declining gross margins.  Senior management was advised of rising inventory
     levels.

14.  ATI provides sales targets to its various divisions.  Those targets have an
     incentive  component  in them  and are set  higher  than  outside  guidance
     including the guidance  referred to in paragraph 10. Senior  management was
     aware during Q3 that ATI was having difficulty achieving sales targets.

15.  ATI's Q2 ended on February  29,  2000.  Sales for the final week of Q2 were
     $155 million and total sales for the quarter were $380 million. Over 40% of
     Q2 sales occurred in the final week of the quarter.






                                                                    Page 9 of 18






16.  From the outset of Q3,  the weekly  sales  summaries  reflected  that sales
     began slowly as compared to sales targets.

17.  March 20,  2000,  the  Vice-President  for Sales in  Europe  warned  senior
     management that Q3 sales targets for Europe might not be met.

18.  On April 11 and 12, 2000, ATI's Controller  informed senior management that
     he had analysed the sales targets for ATI's European Division and concluded
     that the sales target was too high and requested it be reviewed.

19.  On April 19, 2000,  senior  management had the weekly sales summary for Q3,
     week 7. The report indicated that ATI sales to date were $33 million behind
     the sales target.  As the weeks wore on, ATI did not make up its cumulative
     sales target.

20.  On April 21, 2000 the General  Manager of ATI  Technologies  (Europe)  Ltd.
     informed senior  management that forecasted  revenue for Q3 in Europe would
     be $35 million short of the requested sales target.

21.  On April 26, 2000,  the COO emailed the CEO and indicated he wanted to talk
     to him about Q3. He told the CEO that he understood  that ATI had put a lot
     of product  in the  channel  at the end of Q2 which had both  positive  and
     negative  effects.  He wanted to understand the CEO's perspective on Q3 and
     what he would  traditionally do at this point in the quarter. He noted that
     the sales to Original Equipment Manufacturers seemed low to date.

22.  On April 26, 2000,  ATI's  Controller  told the COO that sales did not look
     good for the quarter.

23.  On April 26, 2000 and April 28,  2000,  ATI's CFO  conducted an analysis of
     the anticipated  financial results for Q3 based on input from the company's
     sales managers. On April 28, 2000, he concluded that ATI was still on track
     to meet the bottom end of the range of analyst's expectations formed on the
     basis of the guidance of April 6, 2000 with sales of US $355 million.






                                                                   Page 10 of 18





24.  On May 4, 2000, a customer cancelled a major order.

25.  On May 6, 2000,  in respect of Q3, the COO emailed the CFO that stated that
     he had "talked with Jo-Anne  [Chang] on the question when we go out, she is
     pushing for late May to June 1."

26.  On May 9, 2000,  the CFO  responded to the COO by email and stated that his
     financial  team, in his absence  while he was on holidays,  were working on
     crystallizing  Q3 results and "I think the week I get back (May 15th ... we
     size   up   situation...   and  go  out   that   week   or   perhaps   more
     realistically...the week after...May 22nd)."

27.  On May 11, 2000,  Chang  invited the COO and others to a meeting to discuss
     estimates  for Q3, Q4 and fiscal year 2001,  and strategy  and timing.  The
     meeting did not occur until May 16, 2000.

28.  On May 16, 2000,  senior management of ATI met to conduct a detailed review
     of the financial  results for Q3 2000, which they continued  throughout the
     week.  Upon  conclusion of the review,  senior  management at ATI concluded
     that that the results  for Q3 were  almost  certain to fall short of market
     expectations  and  determined  that it would be appropriate to issue a news
     release and revised forecast,  which lowered revenue expectations for Q3 to
     US $300 million.

29.  The financial  reporting  systems that ATI had in place in fiscal 2000 were
     not  sufficient  to  identify  and assess with a degree of  certainty  on a
     timely basis the  cumulative  effect of various  factors  that  combined to
     produce these results.  The financial  reporting systems at ATI in 2000 had
     not developed at the same pace as ATI's business.  The systems at that time
     were not well integrated and it could take a number of weeks to compile and
     analyze financial data necessary to critically  evaluate the performance of
     the business relative to the guidance and to revise guidance.






                                                                   Page 11 of 18







B.   ATI's Statement to Staff

30.  On August  1,2000,  Staff wrote ATI requesting a chronology of events which
     resulted in the  announcement  of May  24,2000.  In a letter  dated  August
     30,2000 ATI provided a chronology of all material meetings, communications,
     events and developments leading up to the disclosure on May 24,2000. In the
     chronology, the first of all material meetings, communications,  events and
     developments  leading up to the  disclosure  on May 24, was  identified  as
     having occurred on May 16.

Conduct contrary to public interest

31.  ATI acknowledges that in the chronology that was sent to Staff, May 16,2000
     ought  not  to  have  been  identified  as  the  first  material   meeting,
     communication, event or development leading up to the disclosure on May 24,
     and that the identification of that date was conduct contrary to the public
     interest as there were material communications, events or developments that
     occurred  prior to May 16 that were not  identified  in the  chronology  to
     Staff.  The individual  primarily  responsible  for the  preparation of the
     chronology was Chang.

32.  Staff  advise  ATI that as a  result  of their  investigation  Staff  found
     evidence that persons  connected with ATI, some of whom are  Respondents in
     this proceeding may have traded in shares of ATI near the time or after the
     time that there  were  material  communications,  events,  or  developments
     leading up to the  disclosure on May 24, 2000 of ATI's  financial  results,
     but as a result of the chronology provided to Staff, Staff's  investigation
     was made more difficult.






                                                                   Page 12 of 18


33.  ATI  further  admits  that it failed to  disclose  that it was not going to
     achieve analysts' expectations forthwith contrary to the TSX Company Manual
     and thereby acted contrary to public interest.

Subsequent Developments

34.  ATI has  instituted  new  practices  and  procedures  governing  trading by
     insiders, financial reporting, and other corporate governance matters.

35.  Chang left the employ of ATI in September 2000.

36.  ATI no longer compensates directors with stock options.


IV.  TERMS OF SETTLEMENT

37.  The respondent agrees to the following terms of Settlement:

     (a)  Pursuant  to clause 6 of  subsection  127(1) of the Act,  ATI shall be
          reprimanded;

     (b)  Pursuant to subsections 127.1(1) and (2) of the Act, ATI agrees to pay
          the sum of  $100,000 in respect of the cost of the  investigation  and
          hearing  concerning  the conduct of failing to disclose  forthwith and
          agrees  to pay  $300,000  in  respect  of the  additional  cost of the
          investigation concerning the conduct of the making of the statement to
          Staff referred to in paragraph 30, above;

     (c)  That  ATI will  provide  to Staff a  letter  of  comfort  from a party
          acceptable  to  Staff  to  confirm  that  ATI has  instituted  the new
          practices and procedures  related to trading and corporate  governance
          matters  consistent  with the  practices  and  procedures of other TSX
          listed companies; and





                                                                   Page 13 of 18



     (d)  ATI agrees to make a  settlement  payment of  $500,000  to the Ontario
          Securities  Commission  for  allocation to or for the benefit of third
          parties under section 3.4(2) of the Act.

V.   STAFF COMMITMENT

38.  If this Settlement Agreement is approved by the Commission,  Staff will not
     initiate any other  proceeding  under the Act against ATI of its  officers,
     directors or employees  not  currently  Respondents  respecting  all of the
     facts set out in Part III of this Settlement Agreement.

39.  This  Settlement  Agreement  constitutes  full  answer  to the  allegations
     alleged in the Notice of Hearing.

VI.  PROCEDURE FOR APPROVAL OF SETTLEMENT

40.  Approval of this  Settlement  Agreement shall be sought at a hearing of the
     Commission (the "Settlement Hearing") scheduled for March 29,2005.

41.  Counsel  for Staff and counsel for ATI may refer to any part or all of this
     Settlement  Agreement at the Settlement  Hearing.  Staff and ATI agree that
     this  Settlement  Agreement will constitute the entirety of the evidence to
     be submitted at the Settlement Hearing.

42.  If this Settlement  Agreement is approved by the Commission,  ATI agrees to
     waive its rights under the Act to a full hearing, judicial review or appeal
     of the matter.

43.  Whether or not the Settlement Agreement is approved by the Commission,  ATI
     agree  that  they  will not,  in any  proceeding,  refer to or rely on this
     Settlement  Agreement,  the  settlement  discussions/negotiations,  or  the
     process of approval of this Settlement Agreement as the basis of any attack
     on the  Commission's  jurisdiction,  alleged  bias or  appearance  of bias,
     alleged  unfairness or any other remedies or challenges  that may otherwise
     be available.





                                                                   Page 14 of 18


44.  If, for any reason whatsoever, this Settlement Agreement is not approved by
     the Commission or an Order in the form attached as Schedule "A" is not made
     by the Commission:

     (a)  this Settlement Agreement and its terms, including all discussions and
          negotiations  between Staff and ATI leading up to its  presentation at
          the Settlement  Hearing,  shall be without prejudice to Staff and ATI;
          and

     (b)  except  as set out in  paragraph  27  above,  Staff  and ATI  shall be
          entitled  to  all  available  proceedings,  remedies  and  challenges,
          including  proceeding to a hearing of the allegations in the Notice of
          Hearing and  Statement of  Allegations  of Staff,  unaffected  by this
          Settlement Agreement or the settlement discussions/negotiations.

VII. DISCLOSURE AGREEMENT

45.  Except as required above,  this Settlement  Agreement and its terms will be
     treated as  confidential by Staff and ATI until approved by the Commission,
     and forever if, for any reason whatsoever, this Settlement Agreement is not
     approved by the  Commission,  except with the written  consent of Staff and
     ATI, or as may be required by law.

46.  Any obligations of confidentiality  attaching to this Settlement  Agreement
     shall terminate upon approval of this settlement by the Commission.

47.  Staff and ATI agree that if this  Settlement  Agreement  is approved by the
     Commission,  they will not make any public statement inconsistent with this
     Settlement  Agreement.  Nothing in this paragraph  affects the  testimonial
     obligations  of  employees  of ATI if called to be witnesses in this or any
     other proceeding or the right of ATI to make full answer and defence in any
     civil proceeding.





                                                                   Page 15 of 18


VIII. EXECUTION OF SETTLEMENT AGREEMENT

48.  This Settlement  Agreement may be signed in one or more counterparts  which
     together shall constitute a binding agreement.

49.  A facsimile  copy of any  signature  shall be as  effective  as an original
     signature.


DATED AT TORONTO this 28th day of March, 2005.



/s/ Richard A. Brait                          /s/ Michael Watson
- -----------------------                       ------------------------
ATI Technologies Inc.                             Michael Watson
per: Richard A. Brait                             Director, Enforcement
     General Counsel








                                                                   Page 16 of 18



                                  SCHEDULE "A"

                      IN THE MATTER OF THE SECURITIES ACT,
                        R.S.O. 1990, C. s. 5, AS AMENDED

                                     -and-

                     IN THE MATTER OF ATI TECHNOLOGIES INC.

                                     ORDER

                            (Section 127 and 127.1)

     WHEREAS on January 16, 2003,  the Ontario  Securities  Commission  issued a
Notice of Hearing pursuant to sections 127(1) and 127.1 of the Securities Act in
respect of ATI Technologies Inc. (ATI);

     AND WHEREAS  ATI  entered  into a  settlement  agreement  with Staff of the
Commission  dated March 28, 2005 in which it agreed to a proposed  settlement of
the proceeding commenced by the Notice of hearing subject to the approval of the
Commission;

     AND UPON  receiving the  Settlement  Agreement and the Notice of Hearing of
Staff of the Commission,  and upon hearing  submissions of Staff and counsel for
ATI;

     AND  WHEREAS  the  Commission  is of the  opinion  that it is in the public
interest to make this Order;






                                                                   Page 17 of 18





     IT IS HEREBY ORDERED THAT:

     1.   the  Settlement  Agreement  attached to this Order as Schedule  "A" is
          approved;

     2.   pursuant  to clause 6 of  subsection  127(1) of the Act,  ATI shall be
          reprimanded;

     3.   pursuant  to  section  127.1  of the  Act,  ATI  shall  pay the sum of
          $100,000  to the  Ontario  Securities  Commission  in  respect  of the
          portion of the costs of  investigation  and  proceeding in relation to
          the conduct of failing to disclose material information  forthwith and
          $300,000  in respect of the  portion of the cost of  investigation  in
          relation to the conduct  concerning its statement made to Staff of the
          Commission  referred to in  paragraph 30 of the  Settlement  Agreement
          attached to this Order.

DATED at Toronto this 29th day of March, 2005.




    "Wendell Wigle"                                  "Robert Shirriff"
- --------------------------                     -----------------------------
   Wendell S. Wigle                                  Robert L. Shirriff










                                                                        18 of 18


                                   SIGNATURES


     Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned, thereunto duly authorized.


                                ATI TECHNOLOGIES INC.



Date:  March 29, 2005           By:  //David Orton//
                                     ------------------------------------------
                                     Name:  David Orton
                                     Title: President and
                                            Chief Executive Officer