Yes it will work fine no worries it's more then enough. GeForce GTX 680 - On your average system the card requires you to have a 550 Watt power supply unit.
GeForce GTX 680 SLI - On your average system the cards require you to have a 750 Watt power supply unit as minimum.
those cards are beasts! If you have a large budget then two of those are really powerful. However you could save quite a bit if you choose to go with two gtx670s. They perform almost as well as two gtx680's, and can match them if overclocked. And yes, they will work with that power supply, but I would go for a different power supply. Generally there are better power supplies than Cooler Master (they vary from model to model), such as Antec, Seasonic, Corsair, and many others. Technically a 750watt or 800 watt PSU should suffice, depending on your setup, but 1000watts is more than enough.