Doom 3
We generally used in-game controls when possible in order to invoke antialiasing and anisotropic filtering. In the case of Doom 3, we used the game's "High Quality" mode in combination with 4X AA.

ATI's recent driver optimizations for OpenGL are enough to vault the single Radeon X1800 XT ahead of the GeForce 7800 GTX 256MB, but the Radeon X1800 XT in CrossFire can't quite sustain that lead. The Radeon X1800 XL-based CrossFire rig can't catch the dual GeForce 7800 GTs, either. Still, the Radeon X1800 XT CrossFire system cranks out over 85 frames per second at 2048x1536. Like I said, it's a monster. Unfortunately for ATI, the GeForce 7800 GTX 512 is practically otherworldly.