Hello i want to buy a new gpu my current is gt 640 i have stopped at palit gtx 770 and gtx 760 msi am with i5 3350p next year i will try to get the haswell 4670k am not sure so i watched a few videos and on games like bf4 and ac4 i dont see any difference so first of all should i realy get a new cpu fast as i can or i can play with it games like crysis 3 on max with shadow on low and no AA at 60 frames without drops and what psu should i get if i go with the 770? my current is 500w