I have a Q6600 and was considering overclocking but after reading about it, it seams easier to just upgrade as i am also running sli (with a 680i which has no quad overclocking so i would have to get a new mobo) but i want to know how much of a performance increase would i get if i moved to a E8500 or 600. I think my CPU is my bottle neck as i have 4GB RAM 2x8800 GTS 512MB. I also think my 680i is a fairly good overclocker for dual cores. What would the performance increase be?