I think the cpu only comes into play when things are moving about like when you blow a base up I bet a quad core helps a lot more over dual or single in those situations.
I am having great performance on my single core opteron though (8800gts).![]()
even the mobile athlon xp @2.4ghz system i have with x1950pro runs the game good with shaders set to low, shadows set to low, water at medium and everything else at high, even physics at high at a rez of 1360x768.
there is deffo no cpu limitation on this game, its all about the gpu for crysis.