How big of a PS should I get to run 4 7850's?

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I'm assuming this is for mining? You can't CF four 7850s together.

They only have one six pin PCIe plug so TDP is less then 150W. (I think its around 130W.) Four of these would be between 520-600W. Toss in the CPU and rest of system and I'm guessing depending on the CPU you'll need something that can output around 750W all on the 12V rail(s). Gold 850s can probably do this, 1kW units will also be ok.
 
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