X2
Here we have another popular Direct3D benchmark.

There really seems to be no concrete trend: the 6800 is beaten by the 6600GT with no AA/AF, but the tables turn once again when AA/AF are turned on. The plain 6800 and its low clock speed just doesn't do it any good at no-AA/AF performance. None of the three cards did too well at 1600x1200 with 4xAA/8xAF, with all of them falling below 30 FPS.
Splinter Cell
Splinter Cell has also grown to become quite a popular Direct3D benchmark.


The Gigabyte 6800 is consistently faster than the 6600GT by ~5 FPS on Tbilisi 1_1_1 at all resolutions, and ~10 FPS on Tbilisi 1_1_2. The 9800XT falls behind both cards.