What Wattage Power Supply would be best for this PC build?

I am building a PC at the moment and I was wondering with these specs what sort of Power Supply would be needed? and also how much would be needed if I wanted to overclock it?
Here are my specs:
Intel i7 4770k
Corsair Hydro Series H100i
EVGA Nvidia GeForce GTX 780 Classified

also if I wanted to add another 780 would I need another power supply? I don't plan to do this any time soon but just for future reference this would help.
Thank you in advance :)
3 answers Last reply Best Answer
More about wattage power supply build
  1. to run that with 2 770s, I'd suggest a 750 to 850W PSU from Antec, Seasonic, XFX, or Corsair
  2. Best answer
    A good 600-650W will do fine for a single GPU system.

    If you plan on adding a second GPU in the future, you do not need to get a second PSU, you just need a larger PSU.

    I would recommend the Corsair AX860; I'm using an i5-4670k with SLI 780s and it works perfectly fine.
  3. 850 Seasonic or XFX for sli.
    650 for single card.

    No excuse to buy a lesser brand PSU on such a high-end system.
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