I can't remember if the 680s use less power then the 580s, but when I ran sli on 580s I could not run them and my CPU overclocked on a 850W power supply as I would end up pulling too much, cause video drivers to fail/crash and sort of get a soft crash. Seeing as you're using a more power hungry processor then what I'm using (2600k) I'd be very wary of running the 680s above stock.
__________________ Here I am: here I remain
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