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Just bought a second 670 and they are greatly disappointing me.

My two cards are 670 power edition and 670 windforce x3 running off of a 750w psu.

When I first got this card I ran valley in fullscreen I had massive stuttering so flashed the bios of the PE to the 1.212v that the winforce was running. Now all games won't open in full screen however I can run valley in windowed mode with stutter but 75 fps. I have tried blowing in my sli bridge, reseating it, reinstalling drivers, down clocking them. Anyone have any suggestions? Thanks.