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 ?
Note:
If you have problems downloading ATI Catalyst 9.8 Windows XP (32-bit),
please try to stop using your download manager
and avoid right clicking on files. Also, check
your firewall settings, because some mirrors may
require that you do not block the HTTP
referrers. 
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