I use Omega 4.11 betas. Fresh windows and driver install. I don't really have any problems running newer games. I can play games like Pacific Assault, Doom 3, Half Life 2, far cry, etc on 1024 X 768 resolutions with settings ranging from medium to high. Most games average 45-55 frames per second. Farcry and PA I have to use shader 1.0 though or it starts to chug in heavy fighting. I don't mess with AA/AF to much. At most I'll put a game at 2x/4x if that. KOTOR 1 I could run with max AA/AF. The only game I can't get to run very well is Vampire MAsquerade Bloodlines. The game chugs at hubs and when it rains. =/
My system
3.2 P4 Prescot
1 gig ddr
MR 9700 128 mb