670 SLI power consumption

Cpu Intel i5 3750K ivy-bridge
GTX 670
GTX 670

I am planning on getting a 850w power supply is this going to be enough power to support these 3 things along with everything else? I am planning on overclocking everything, not going to go crazy on the overclock tho just slightly.

Thank you in advance!!!!
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  1. Best answer
    Yes 850watt is plenty! Gives a nice headroom but 750watts would be enough.
  2. Best answer selected by chugginmilk.
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