Was having problems, strange ones. Unigine and Crysis 2 would cause a nasty freezup and reboot, screen would go black and have purple bits on it, and would restart the pc even if I had restart pc on failure unchecked.
EVGA just gave me a GTX 760 to replace the GTX 660Ti (and saved $20 lol...) and so far everything is better, but I can tell the Cpu is still holding it back quite a bit.
EVGA has pretty damn good support, sent me a new card no questions, I just return this 660Ti, saved money too, and surprisingly it's quite a bit faster, 256bit memory bus in the 760 vs 192 in the 660Ti, and although fewer cuda cores it scores much higher in Unigine and 3DMark 11, also boost clocks are quite a bit higher. I highly recommend this card, even best buy has them for $299.99.