I'm gonna go and say yes in hope that all 3 of your cards get fryed because you're so greedy. 2x580 is more than enough. Also, use 150W power supply if you want to run a PC with 3 video cards, don't take those 700W pieces of crap, just to make sure it doesn't overheat.
You mean 1500W?
That's too much for that.
A 1,200W would suffice for those three cards.