Thief: Deadly Shadows
This third-person 3D shooter is a pixel-shader-heavy application, so ATI’s cards run it faster overall. The game is also sensitive to the graphics memory bandwidth as the results of the GeForce 6600 GT AGP suggest which is slightly slower than the RADEON 9800 XT.
The SLI technology, like in many other games, is deficient – the performance degrades if you turn it on. The testbed didn’t hang up, though.