Unreal Tournament 2004
We're using scaling graphs to show just how fill rate and pixel shader performance differences separate the men from the boys, but keep your eyes on the rightmost scores on each graphand especially on the graphs with 4X antialiasing and 8X anisotropic filteringif you want to see the most relevant numbers.
All of the next-gen cards perform well in UT2004, but the Radeon X800s do best. The X800 XT PE beats the GeForce 6800 Ultra by just over 10 frames per second at 1600x1200 with 4X AA and 8X AF, though the Extreme card narrows that gap a little. And the X800 Pro also tops the GeForce 6800 Ultra, surprisingly enough.
Quake III Arena
In ye olde
Quake III Arena, the situation is reversed, with the GeForce 6800 GT outperforming the Radeon X800 XT PE. NVIDIA has long done well in OpenGL games, and the results here suggest that trend will continue.