thats not true, when i had my single core athlon 4000+ and my 7950gt i could just run medium, oncei got my q6600 i was able to max it with the 7950gt, you need atleast duel core. call of duty 4 is a preaty cpu dependant game.
Wow... Didn't see that coming, because on my friends rig, he had an 3200+ and went to a Socket 939 Opty 165 and his COD4 performance didn't increase much (he reused his video card though)