Catalyst Roundup 2005
 

Das sind die bisher getesteten Treiber:

Catalyst 5.1
Catalyst 5.2
Catalyst 5.2 (8.1.0.2)
Catalyst 5.3
Catalyst 5.4
Catalyst 5.5

Omega 2.6.25
DNA Drivers 3.9.5.4
Omega 2.6.0.5a
DNA 3.6.5.1a
Omega 2.6.12
DNA 3.7.5.2
TC ATI Optimized Driver 5.2

http://www.origo3d.com/Catalyst-Roundup-2005.shtml

so in conclusion; no matter what version you have, performance is all the same (~3fps difference max); only worry about game compatibility (get the latest version if you have any issues) or if you need extra features for overclocking/settings