That unit is absolute junk. Any 650w psu that does not have two 6 pin pci-e leads is junk.
If you look at the specs, it says it can deliver only 22a on the +12v rail. That is about what a 300w psu can do.
They get 680w by delivering amperage to the 3 and 5v leads which is easier to do, but the graphics cards use 12v.
Do not plug it in!!! It can not only fail, but it can destroy anything it is connected to.
Stick with a quality psu. My short list of quality psu's would include Antec, Corsair, XFX, Seasonic, and PC P&C.
This Corsair 500w unit will do the job.
It delivers 34a. http://www.newegg.com/Product/Product.aspx?Item=N82E16817139027