Power supply for SLI?

Potato Joe

Reputable
Jun 3, 2015
151
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4,690
I have a single GTX 970 in my system at the moment but I'm upgrading everything when I get my tax return back (also my 4790 is part dead from a voltage spike, getting a 5820k since I started editing videos) and I was going to sell the 970 and get either three 980 or two 980 Ti depending on what my power supply can support. It's an EVGA Supernova 850B2 semimodular.
 
I just sorta assumed that since a 980 consumes a bit less power it would handle it, albeit probably hotter/louder than I would probably like. Thanks for saving me from my own impulsiveness.