Unreal Tournament III
The HD 3870 X2, for some reason, still refuses to apply antialiasing with Unreal Tournament III (unlike the HD 3870), but it still posted the best performance, though it doesn't really make a difference given the high performance level already achieved by the other cards. The 9800 GTX was especially at ease with this game, managing to beat out the 8800 Ultra and sailing past the 8800 GTS 512 MB by such wide margins (27% on average, and up to 40%) that the explanation, once again, can only be the lack of optimization of the 8800 GTS 512 MB's drivers.