Catalyst 7.5 now available
OpenGL performance in Windows Vista improves on the Radeon X1950 XTX at high resolutions (1920×1200 or greater) with anti-aliasing and anisotropic filtering enabled. Doom 3 and Quake 4 improves as much as 13-18% .and Prey improves at least 15.6%. The Radeon X1950 Pro and Radeon X1650 XT also see improvements in Doom 3 and Quake 4 up to 14.1% at higher resolutions with anti-aliasing and anisotropic filtering enabled.
The release of Catalyst 7.5 also introduces DirectX 10 support for users running a Radeon HD 2900 XT under Vista x86, for both single and Crossfire configurations.
Weighing in at 40MB, you can grab a copy for your desired operating system here.