I had troubles with my gtx 760 running gta 5, kept crashing every 2 mins into the game, put my oc'd frequency back to stock an it runs fine. then touch the memory a bit to see the problem an it started crashing again, even a little 100mhz oc on the memory, an it crashes. then i touched on my...
just bought one of my customers a gigabyte gtx 770 windforce, testing it out right now as i type, an its getting 1230mhz core in game frequencies(didn't oc it yet just straight up was gpu boost 2.0 gets it up too) an i am getting a bit faster framerates then they are with there oc'ed 280x, paid...
if you at 1680x1050 either one is good about the same at the res, i went from a 6970 to a gtx 760 an loving it, didn't go amd again caz i was scared of the crossfire micro studder but since thats goin to be fixed very soon, its all about what one you can get cheaper, if i were you i'd get after...
always loved sli ever since i had two 7600gs's, had no problems, so i know when the 8800gt's came out i had to get two, an i did. those 2 8800gt's in sli lasted me so long till more an more dx11 games came out an i knew i had to upgrade. then sold them for 2 gtx 460's was getting phenomenal...
if mainly for gaming don't need the i7 grab yourself the 3570k, don't need hyper treading if you just gaming. then with the 100$ you'll save gettin the 3570k you should be able to upgrade the gpu from a 660, to a 660ti, you could even go 7950 its a little faster then the 660ti, but if you wanna...