Serious Sam II
Here's a new game with a new game engine that takes advantage of all of the hottest lighting and shading techniques. Unfortunately, we decided not to test with high-dynamic-range lighting on this game because it didn't appear to work correctly on Radeon X1000-series cards. Perhaps a future patch or driver update will resolve the problem.

This one is a close call for the 7800 GTX 512. The Radeon X1800 XT comes within a half-frame per second of catching up at 1280x960, but the gap widens again at 2048x1536.