Call of Duty

It is obvious here that Call of Duty's enhanced Quake 3 engine prefers the GeForce 6 series over the X800 series. With no AA/AF, the regular 6800 takes a huge lead over the other three participants, which stay in a tight group an average of 20 FPS behind the 6800.
When it comes time for AA/AF, things start out similarly at 1024x768, but then the two 128 MB GeForce cards take a performance nosedive at the higher resolutions. This nosedive lets the two X800s take a tight first and second place.
Jedi Knight 2

The initial results for non-AA/AF scores are very similar to that of what we saw in Call of Duty. As the resolution increases, the 6600 GT's performance drops, and it ends up behind the Gigabyte X800. All four cards fan out a good deal more than we witnessed in CoD. Rather than staying in tight groups, we see more variation in the scores.
Anti-aliasing/anisotropic filtering scores paint a similar picture to that of non-AA/AF scores. The nosedive no longer occurs at the higher resolutions with the GeForce cards, as JK2 does not use as many/detailed textures as CoD. Throughout all the tests, the Gigabyte X800 takes an interchanging third and fourth place.
In general, the Gigabyte X800's scores are not overly impressive at the higher resolutions with AA/AF, but it ought to provide a very smooth gaming experience at any resolution with no AA/AF, and 1024x768 with 4xAA/8xAF.