Psu requirement

Minimum 650w psu

If you do land on a 650 watt PSU I would go with this one. It's nice because it has 2 6+2 connections which you won't but its a nice added bonus. Also the more important thing is that this power supply unlike a lot of other 650 watt power supplies comes with 4 pci express power connections and I know you can always use molex to pci express adapters but you don't with this one.
http://www.newegg.com/Product/Product.aspx?Item=N82E168...