---

# SECURITIES AND
EXCHANGE COMMISSION

Washington, D.C. 20549

# FORM 40-F/A

[Check one]

[   ]    REGISTRATION STATEMENT
PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934

[X]    
          ANNUAL REPORT PURSUANT TO SECTION 13(a) OR 15(d) OF THE SECURITIES EXCHANGE ACT
          OF 1934

| | For the Fiscal Year ended |  | Commission File Number
| | ------------------------- |  | ----------------------
| | August 31, 2004           |  | 029872                

ATI TECHNOLOGIES INC.
(Exact name of
registrant as specified in its charter)

|Canada                                    | 5045, 3575                                     
|----------------------------------------- | -----------------------------------------------
|                                          |                                                
|(Province or other jurisdiction of        | (Primary Standard Industrial                   
|incorporation or organization)            | Classification Code Number (if applicable))    
|                                          |                                                
|1 Commerce Valley Drive East              | CT Corporation System                          
|Markham, Ontario, Canada L3T 7X6          | 111 Eighth Avenue                              
|(905) 882-2600                            | New York, NY 10011                             
|                                          | (212) 894-8700                                 
|                                          |                                                
|(Address and telephone number of          | (Name, address (including zip code) and        
|Registrants principal executive offices) | telephone number (including area code) of agent
|                                          | for service in the United States)              

Securities registered or to be
registered pursuant to Section 12(b) of the Act:  None

Securities registered or to be
registered pursuant to Section 12(g) of the Act:  Common Shares

Securities for which there is a
reporting obligation pursuant to Section 15(d) of the Act:  None

For annual reports, indicate by check
mark the information filed with this Form:

[   ]  Annual information form
          [   ]  Audited annual financial statements

Indicate the number of outstanding
shares of the issuers classes of capital or common stock as of the close of the
period covered by the annual report:          As at August 31, 2004  249,278,125 Common
Shares outstanding.

Indicate by check mark whether the
Registrant by filing 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 (the Exchange Act). If Yes is marked,
indicate the filing number assigned to the Registrant in connection with such Rule.

Yes  ______            No  ___X___

Indicate by check mark whether the
Registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the
Securities Exchange Act during the preceding 12 months (or for such shorter period that
the Registrant was required to file such reports) and (2) has been subject to such filing
requirements for the past 90 days.

Yes  ___X___    
        No  ______

---

The
total number of pages in this document is 7. The exhibit
index is located on page 5.

Page 1 of 7

---

# EXPLANATORY NOTE

This
Amendment No. 1 to the Annual Report of ATI Technologies Inc. (the Registrant)
on Form 40-F/A for the year ended August 31, 2004 is filed herewith for the sole purpose
of supplementing the information contained in the Registrants Annual Report on Form
40-F dated January 14, 2005 by disclosing that pursuant to Rule 4350(a)(i) of the Nasdaq
Stock Market, Inc. (NASDAQ) Market Rules, the Registrant relies on the
following exemptions:

|1) |  | an exemption from Rule 4350(f) of the Marketplace Rules granted to the
               Registrant in connection with its initial listing on the NASDAQ in 1998,
               requiring that each Nasdaq-quoted company have in place a minimum quorum
               requirement for shareholder meetings of 33 1/3% of the outstanding shares of the
               companys voting common stock. In accordance with the provisions of section
               139(1) of the Canada Business Corporations Act (the
               CBCA), the Registrants by-laws provide that a quorum is met if
               holders of at least 5% of the votes eligible to be cast at a meeting are present
               or represented by proxy at a shareholder meeting. The Registrant understands
               that it is not unusual for a similar quorum requirement to be found in the
               by-laws of other publicly-traded corporations subject to the CBCA; and
|-- |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|2) |  | an exemption from Rule 4350(i)(1)(A) of the Marketplace Rules granted to the
               Registrant on February 18, 2005, requiring that each Nasdaq-quoted company
               obtain shareholder approval of certain amendments to equity compensation plans.
               The exemption was granted to the Registrant in connection with the following
               amendments made to its share option plan (the Plan): (i) setting
               forth additional terms and conditions for the Registrants employees in
               India; (ii) reducing the maximum term of future options to 7 years from 10
               years; (iii) allowing unvested options to vest immediately upon the death of a
               participant; (iv) allowing, in the Registrants discretion, continued
               vesting of a participants options upon termination of employment other
               than for cause; and (v) allowing the Registrants board of directors to
               establish an exercise price for an option that is greater than the then current
               fair market price for the Registrants common shares (collectively, the
               Amendments). Under Canadian law, the Amendments to the Plan do not
               require shareholder approval. In addition, on November 19, 2004, the Toronto
               Stock Exchange (the TSX) confirmed that there is no requirement
               under the rules of the TSX that the Registrants shareholders approve the
               Amendments to the Plan. The Registrant understands that it is not unusual for
               other corporations with securities listed on the TSX to make similar amendments
               to their share option plans without shareholder approval.
|-- |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Page 2 of 7

---

# UNDERTAKING AND
CONSENT TO SERVICE OF PROCESS

A.    Undertaking

The
Registrant hereby undertakes to make available, in person or by telephone, representatives
to respond to inquiries made by the SEC staff, and to furnish promptly, when requested to
do so by the SEC staff, information relating to the securities in relation to which the
obligation to file an annual report on Form 40F/A arises, or to transactions in said
securities.

B.    Consent to Service of Process

The
Registrant has previously filed with the SEC a Form F-X in connection with the Common
Shares.

Page 3 of 7

---

# SIGNATURES

Pursuant
to the requirements of the Exchange Act, the Registrant certifies that it meets all of the
requirements for filing on Form 40F/A and has duly caused this Annual Report to be
signed on its behalf by the undersigned, thereunto duly authorized.

| | ATI TECHNOLOGIES INC.                
| | -------------------------------------
| |                                      
| |                                      
| | //David Orton//                      
| | David Orton                          
| | President and Chief Executive Officer

Date: March 30, 2005

Page 4 of 7

---

# EXHIBIT INDEX

|   |                                                                                                                                     | SequentialPage
No.
|-- | ----------------------------------------------------------------------------------------------------------------------------------- | ------------------
|1. | Certificate of David Orton required by Rule 13a-14(a) or
Rule 15d-14(a), pursuant to Section 302 of Sarbanes-Oxley Act of 2002.     | 6                 
|2. | Certificate of Patrick Crowley required by Rule 13a-14(a) or Rule 15d-14(a),
pursuant to Section 302 of Sarbanes-Oxley Act of 2002. | 7                 

Page 5 of 7