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.

Yow. The Radeon X1800 XL CrossFire setup beats out the GeForce 7800 GT SLI system in Serious Sam 2, at least at higher resolutions, and the X1800 XT CrossFire nearly catches the GTX 512.