I am running 1600x1200 and using a Core2Quad Q6600, w/4GB memory on EVGA 8800GTS 640MB. I have played Crysis on both Vista and XPSP2 w/DX10 w/hack, settings all HIGH with no AA at all. No difference in game performance between the two OS.

However I seriously need some kind of upgrade because though I get good fps when nothing is happening, any multiple enemy shooting or big explosion causes major lag. If I back my resolution down to 1280x1024 there is no lag.

Am I missing something, or do I really need to get a 2nd 8800GTS and PSU upgrade in order to improve the game play?