Sapphire Ultimate X1600 Pro and X1600 XT
Quake 4
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Nvidia has traditionally held the upper hand when it comes to OpenGL games, and id software's Doom 3 engine is no different. With Quake being based on the Doom 3 engine, it's no surprise the 6600 GT manages an almost 13FPS lead on the X1600 XT. However, when AA and AF are applied, the playing field becomes a bit more even, and the X1600 XT even gains a few FPS on the 6600 GT. The X1600 Pro is where it's been the whole time, stuck right in the middle.
With the resolution raised, Nvidia's GeForce 6600 GT still puts out a somewhat tolerable framerate at the default image quality settings, however Quake 4 becomes a bit sluggish when run on either of our X1600 cards.