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 latest drivers just recently delivered the single-card Doom 3 title belt to the red team, and NVIDIA's latest hardware easily takes it back. With two 7800 GTX 512 cards in SLI, Doom 3 flirts with 120 frames per second at 2048x1536. This is with 4X antialiasing and 8X anisotropic filtering, no less. Yow.

Notice how the GeForce 6800 GS's performance drops more than most cards' at 2038x1536. That's because the GeForce 6-series GPUs are at an architectural disadvantage at resolutions above two megapixels.