Read the full release on ATI.com.

ATI Leverages Breakthrough AMD 64 Dual-Core Technology to Drive Graphics Industry Forward

MARKHAM, ON — April 21, 2005 — To mark the 2nd anniversary of the AMD Opteron™ processor platform, ATI Technologies Inc., (TSX: ATY, NASDAQ:ATYT) affirms its ongoing support of AMD’s (NYSE : AMD) industry-leading initiatives. ATI is now positioned to translate the tremendous success with the AMD Opteron processor platform and 64-bit technologies into new opportunities with the introduction of Dual-Core AMD Opteron processors.

“The introduction of Dual-Core AMD Opteron processors with Direct Connect Architecture represents a major turning point for the industry and our strong relationship with ATI is a key to our success in driving change,”

said Marty Seyer, Corporate Vice President and General Manager, Microprocessor Solutions Sector, AMD. “We look forward to continuing our work with ATI, improving the performance of multimedia and digital content creation applications, turning unimaginable computing capabilities into everyday reality.”