Aquamark 3

I'll get the 6800 Ultra out of the way and say that it gets completely obliterated by every other card here. That said, the almost irrelevant variation between the scores of the other three cards is amazing -- especially at the 4x AA/8x AF-enabled resolutions. The 7800 GTX seems to have a mere ~3 FPS lead over the 7800 GT at 1600x1200 here. Things are getting interesting indeed.
Far Cry

Here we can see the X850 flirting around with the other NVIDIA cards. Sometimes it is on top, sometimes it's third, and sometimes it just matches the 7800 GTX. In either case, it seems to be the fastest when it comes to the AA/AF resolutions, though the story doesn't end there. While the 7800 GTX seems to have a healthy lead over the 7800 GT at regular resolutions, once we hit the AA/AF highway, this difference is less spectacular. At both 1280x1024 and 1600x1200 with 4x AA/8x AF, the 7800 GTX just barely manages to edge out the 7800 GT. The poor 6800 Ultra is getting stomped on.