Over at Quakecon Ian “Cabrtosr” McNaughton released Catalyst 9.8 drivers. With this driver, you should see significant performance increases on AMD platforms.
These improvements are more platform related – you will see gains of up to 50% in some titles (like Far Cry 2) when using a CrossFire solution with 4870 X2 or other 4xxx series in resolutions 16x10 and higher – you’ll see these gains mostly in CPU-bound situations. You will also see significant improvements in titles like HAWX, Crysis, Company of Heroes and World in Conflict.
We have a discussion thread open on these drivers right here.
Have you read Guru3D's Windows 7 vs Vista VGA game performance article already ?