In case you may have missed it, the 7.5 version of the Catalyst software is now available for download.
http://ati.amd.com/support/driver.html
OpenGL performance is improved on the ATI Radeon? X1950 XTX at high resolutions (1920x1200 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 ATI Radeon? X1950 Pro and X1650 XT also sees improvements in Doom 3 and Quake 4 of up to 14.1% at higher resolutions with anti-aliasing and anisotropic filtering enabled.