Quake 4
In order to make sure we pushed the video cards as hard as possible, we enabled Quake 4's multiprocessor support before testing.

The 7900 GS is neck and neck with the 7900 GT in Quake 4, well ahead of the Radeon X1800 GTO. Two 7900 GS cards in SLI are a very close match for a GeForce 7950 GX2, as well.

Notice, interestingly enough, what exactly you gain by going from a GeForce 7600 GT to a 7900 GS: about one notch up the display resolution latter. The 7600 GT hits 65.6 FPS at 1024x768, while the 7900 GS hits 64.1 FPS at 1280x1024—approximately equal performance. This dynamic holds true if you raise the resolution for both cards another step—and another.

Also note that the GeForce 7600 GT owner would do better to add a second 7600 GT in SLI than to ditch his current card and slap in a GeForce 7900 GS—or, heck, even a Radeon X1950 XT 256MB.