HSINCHU, Taiwan and MARKHAM, ON—October 27, 2004 - UMC (NYSE; UMC) has delivered the 20 millionth RADEON 9200 chip to ATI Technologies Inc. (TSX:ATY, NASDAQ:ATYT). The chips, created with 0.15 micron process technology and manufactured on UMC's 300mm fab 12A in Tainan and 8F 200mm fab in Hsinchu, Taiwan, bring well-needed graphic capabilities to personal computers.

Fu Tai Liou, president America Business Group at UMC noted, "ATI, a long-term partner of UMC, continues to demonstrate its leadership in the PC graphic chip industry. We are enthusiastic about the delivery of the 20 millionth RADEON 9200 chip, particularly as we reached this goal with high-yield performance and exceptionally low-defect densities, and on 300mm silicon."

Rick Bergman, senior vice president, PC Business Unit, ATI Technologies Inc., stated, "Working with UMC has enabled ATI to very successfully deliver world-beating graphics to price-conscious customers. UMC has helped us make the RADEON 9200 the solution of choice for a wide range of PCs worldwide."

The RADEON 9200 graphics chip is powered by an advanced quad-pipe rendering architecture and features a full suite of performance and image quality-enhancing technologies including advanced shader support and streaming video de-blocking capabilities. The RADEON 9200 products deliver an enhanced visual experience for personal computers.

UMC (NYSE: UMC, TSE: 2303) is a leading global semiconductor foundry that manufactures advanced process ICs for applications spanning every major sector of the semiconductor industry. UMC delivers cutting-edge foundry technologies that enable sophisticated system-on-chip (SOC) designs, including 90nm copper, 0.13um copper, and mixed signal/RFCMOS. UMC is also a leader in 300mm manufacturing; Fab 12A in Taiwan and Singapore-based UMCi are both in volume production for a variety of customer products. UMC employs over 10,500 people worldwide and has offices in Taiwan, Japan, Singapore, Europe, and the United States. UMC can be found on the web at http://www.umc.com.

ATI Technologies Inc. is a 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 visual processor unit (VPU) 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 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). ATI can be found on the web at www.ati.com.