Just built a new system, xfx 750i/Q6600, pc6400sli ram 8gigs, 750 watt corsair for two 260 xfx vc's, mascool heatsink, artic silver 5, Diablo full case Large fans, would not boot d4 Dead board!!! Sent it back to TD, going to put the q6600 back into my 420, oc'd to 3.0 Need help selecting a new cpu/mb combo have been reading tons of forums, and am now totaly lost. LOL Do not want to hastle to sell my 260's so i am somewhat limited to a nvidia chipset, want to play my bioshock,coh,fallout 3. will spend 3-4 hundred on combo? Thanks all in advance.