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.” Breakthrough advances by AMD continue to be supported in the server space by ATI products such as Rage™ XL, Radeon® 7000 and the recently announced ES1000™, designed for stability and flexibility across a wide range of server platforms. “ATI has always been proud to partner with AMD and we fully support both AMD’s aggressive and innovative vision for pervasive multi-core processing and the exciting developments that lie ahead in 2005,” said Rich Heye, Vice President and GM, Desktop Discrete Products, ATI Technologies Inc. “ATI is committed to delivering products that continually set industry standards for stability, flexibility and software support as AMD drives the critical server market forward.” The launch of the AMD Opteron processor in 2003 introduced AMD64, a new class of x86 computing, representing an evolutionary path to pervasive 64-bit computing by enabling 32- and 64-bit simultaneous computing. CATALYST - ATI's industry leading software suite provides full support for the 64 bit ecosystem, and combined with an Opteron ensures the maximum stability available in a graphic driver. AMD continues to be the driving force behind the industry’s evolutionary shift to pervasive, mainstream x86-based 64-bit computing and the upcoming release of the first dual-core products for servers and workstations, followed by dual-core processors for the client markets.