750W PSU or more for GTX 680 in SLI..

I am planning to buy the Corsair HX or AX 750 W. Will it be enough or should i upgrade to AX/HX 850 or maybe a Seasonic series x 850km 850W. Which do you guys recommend. Pair all that with:
overclocked i5 3570k, z77 ASRock Extreme 4, 16 GB RAM.. SSD and HDD.. HAF 912 case(stock).. Would also like to have enough headroom for more fans or a fan controller..
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  1. Best answer
    An 850W unit might be justified if you're going to a) do a lot of overclocking and b) run power intensive programs (as bad as torture tests like Furmark) on a regular basis.
  2. Best answer selected by 1c3M4Nz.
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