I noticed a bit of shimmering but a large amount of it went away when I knocked my GPU core down another 5MHz. The rest of the shimmering (I am playing FarCry now so this is the only example I have) goes away when I turn HDR off and knock the AA back all the way up. Now the Source engine gives me ZERO shimmering. 78.03 drivers btw. I dont know if it counts because my last ATI was a 9600 but I do prefer ATI over nVidia for some reason. Keep in mind I have had about 85% nVidia cards too