[SOLVED] how much power would be need for this set up

I would probably look at a 650W or larger; as an absolute bare minimum 550W.

Don't forget to verify that the power supply has sufficient CPU/PCIe connections for the video card (probably a 6-pin + an 8-pin PCIe connector) and the motherboard (probably a 8-Pin EPS and a somewhat optional 4-pin ATX).
 
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