I have a 240 and a 140 cooling 2 x EVGA GTX 670 FTW and an overclocked Ivybridge with a similar TDP to your cpu (once overclocked)....
I believe that the extra 680 won't be that much of a stretch. A 360 and a 240 will be fine , if temps start to creep up then at least you know that you have the option of mounting an extra 140 rad at the back....


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