Quake 4 is based on the engine that powers Doom 3 and is an OpenGL game. Quake 4 is a very relevant test as this is obviously a very popular multiplayer game. Having a low framerate while competing in a local LAN is only going to hurt your chances of winning. We tested with in-game quality set to High.
The 6600 performs very well considering it’s pricepoint. Again with quality settings set to high we have very playable frame rates. Obviously it’s not as fast as the other two cards but they will set you back more money.