How much watts do I need for 2 GTX 780 SLI and I5 4670K OC'd @ 4.5Ghz

First build I don't know if I should go with a high quality 750w or a high quality 850w
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    Guru3d had their 780 SLI system pulling down 544W with the GPUs loaded up, with a heavy CPU load as well you could expect 650W, if you are OCing the GPUs as well you will likely push in excess of 750W. I'd go for an 850W PSU for running two top tier GPUs.
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