CORRECTION: ATI Drives the Overwhelming Majority of Windows Vista'TM' PCs at Microsoft's Windows Hardware Engineering Conference 'WinHEC'

The following corrects and replaces the release sent on May 23, 2006 at 0600 ET titled "ATI Drives the Overwhelming Majority of Windows Vista'TM' PCs at Microsoft's Windows Hardware Engineering Conference 'WinHEC'". There was an error in the body of the release. The complete and corrected release follows.

ATI Technologies' (TSX: ATY)(NASDAQ: ATYT) superior support of Microsoft Windows Vista(TM) has made the company's graphics processors the natural choice to power an overwhelming majority of demo PCs running the new operating system at WinHEC, May 22-25 in Seattle, WA. Over 220 Windows Vista demo systems on display at the event feature ATI graphics processors-a testament to ATI's exceptional driver stability and advanced support of the new operating system which is set to launch to consumers in January 2007.

Windows Vista demonstration PCs at the event which use ATI graphics processors include 35 AMD gaming systems running the latest game titles on the new operating system, as well as 185 desktop PCs-all of which are publicly accessible by conference delegates to experience Windows Vista first hand.

"Windows Vista represents a huge opportunity for ATI because it makes dedicated, high performance graphics matter to everyone, not just gamers," said Ben Bar-Haim, VP of Software, ATI Technologies. "The fact that ATI is driving the vast majority of publicly displayed Windows Vista demo PCs at WinHEC demonstrates we are more than ready for the new operating system when it launches- with our complete top-to-bottom line of graphics processors."

ATI offers a complete line of Windows Vista-ready graphics processors at every price point including:

ATI product series supported by Windows Vista:

- Radeon® 9500, 9550, 9600, 9650, 9700, 9800, X300, X600, X700, X800, X850

- Radeon® X1300, X1600, X1800, X1900 series

- Mobility(TM) Radeon® 9550, 9600, 9700, 9800, X300, X600, X700, X800

- Mobility(TM) Radeon® X1300, X1400, X1600, X1800

- Radeon® Xpress 200, 200M

- FireGL(TM) V7350, V7300, V7100, V5100, V5000, V3200, V3100

- Mobility(TM) FireGL® V5200, V5000, V3200, V3100

- FireMV(TM) 2200 PCIE, FireMV(TM) 2400 PCIE

Drivers for these products can be downloaded on ATI.com at the following URL: https://support.ati.com/ics/support/default.asp?deptID=894&task=knowledge&questionID=19933 (Due to the length of this URL, it may be necessary to copy and paste this into your web browser).

About ATI Technologies

ATI Technologies Inc. is a world leader in the design and manufacture of innovative 3D graphics, PC platform technologies and digital media silicon solutions. An industry pioneer since 1985, ATI is the world's foremost graphics processor unit (GPU) provider and is dedicated to deliver 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 fiscal 2005 revenues of US $2.22 billion, ATI has more than 3,700 employees in the Americas, Europe and Asia. ATI common shares trade on NASDAQ (ATYT) and the Toronto Stock Exchange (ATY).

Important Information Regarding Forward-looking Statements

Certain statements in this news release, including but not limited to ATI's product readiness for Windows Vista and the opportunity created by Windows Vista, may be considered "forward-looking". Such forward-looking statements are based on current expectations, and, accordingly, entail various risks and uncertainties. Risks that could cause actual results to differ materially from such forward-looking statements include potential software or hardware-related issues or conflicts, the development of new products or technologies, the evolving nature and requirements of Microsoft Windows Vista, and other unforeseen risks. We therefore cannot provide any assurance that such forward-looking statements will materialize. We assume no obligation to update or revise any forward-looking statement, whether as a result of new information, future events or any other reason. Additional information concerning risks and uncertainties affecting our business and other factors that could cause actual results to differ materially from any forward-looking statement is contained in our filings with Canadian and U.S. securities regulatory authorities, including our 2005 Annual Information Form and 2005 Annual Report filed on SEDAR at www.sedar.com . Our Form 40-F and other filings we make with the U.S. Securities and Exchange Commission are available on EDGAR at www.sec.gov .

Copyright 2006 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.

Contacts: ATI Technologies Inc. Nicole Emanuel Public Relations Manager (905) 882-2600 x3907 nemanuel@ati.com Other ATI Contacts: Adam Zolis High Road Communications (416) 644-2237 azolis@highroad.com For investor relations support, please contact: ATI Technologies Inc. Zev Korman, Investor Relations (905) 882-2600, Ext. 3670 zev@ati.com