I Am finishing a build xfx750imb,8mb nvsli 6400ram,750 watt corsair psu,wd640gb 7400,32mb cache, after market mascool heatsink,sli 260/216 vc's, Diablo full size case/w plenty of fans. Question-am I better off going with a new pd965ext,which i have or my q6600 from my dell xps 420. Thanks in advance. basically used for gaming