What psu wattage would I need to run two gtx 970s in sli

Solution
A good 750W PSU is what I'd recommend. Here are my recommendations:
EVGA 750W 80+ Bronze Certified Semi-Modular ATX Power Supply
XFX ProSeries (Black Edition) 750W Fully Modular 80+ Gold Power Supply
Seasonic S12G-750 750W 80+ Gold Certified Wired Power Supply

syked3

Reputable
Jul 7, 2015
922
0
5,660
A good 750W PSU is what I'd recommend. Here are my recommendations:
EVGA 750W 80+ Bronze Certified Semi-Modular ATX Power Supply
XFX ProSeries (Black Edition) 750W Fully Modular 80+ Gold Power Supply
Seasonic S12G-750 750W 80+ Gold Certified Wired Power Supply
 
Solution
For stock operation, 650W should be sufficient. For overclocking, you'll want 750W. You want a high quality PSU, such as one made by Seasonic (their own, XFX, EVGA GS, some Antec) or Super Flower (EVGA G2 or B2, Kingwin Lazer, Rosewill Capstone).