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You sir need better raddage on the front rad. That fan isn't doing much at all. Your loop is set good, decent CPU mount but you need more cooling. Your at 120x2= xx sq mm of cooling and the front rad. Most of us with an overclocked 680 and a pretty hot CPU (TDP) at stock would run a bit more rad.
Tell us about your fans. And did you dump the crap ASUS software for temps and use what I SUGGESTED you use? If not redo it and use what I suggested before replying please.