the 6600 is faster. However the x300pro isn't too far behind and is also a decent card for the money
He meant the new generation ATI 1300 not the x300. They are about the same though. I would go with 6600 (Nvidia fan)
Wait in your title says "Quake"...does this mean you are planning to play one of the Quake games (Quake 4)? Then I strongly suggest the Nvidia 6600 because Nvidia is known to have beastly cards supporting OpenGL. My 6800 blazed through Quake 4 and Doom 3 on high settings.
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