That's weird I have a similar setup as you and things are running fine except for occasional light flickers. z77 3770k 4.5ghz gtx680sc 16gb ram

Just putting this out there. If you haven't tried already, turn off graphics switching if you set that up. Check your nvidia settings to make everything application controlled. And take a look at what proccess are running in the background when your playing the game. Other than that sorry =(