What size PSU should I use

I am running an I7 4770k CPU with and Asus Maximus VI Hero motherboard. And i have 1 256gb SSD and 1 1tb Hard drive and, an H100 hydro cooler. I am using a GTX 780 ACX graphics card and its all being powered by a Corsair AX850 and i have no problem with power or anything like that. My question is, I am going to buy another GTX 780 ACX and I'm not sure if I need a bigger PSU or if the 850 is enough to power everything I have plus another 780. I have seen videos on YouTube from Asus's channel and they have 2 780's power by an 850 PSU. So do I need more power or is an 850 enough power to run my system plus 2 780's in SLI?
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  1. Best answer
    Seasonic made and Gold Certified and Full Modular.

    The 850w will do , but I'd go for some extra headroom.

    PCPartPicker part list / Price breakdown by merchant / Benchmarks

    Power Supply: Cooler Master V1000 1000W 80 PLUS Gold Certified ATX12V / EPS12V Power Supply ($129.99 @ Newegg)
    Total: $129.99
    (Prices include shipping, taxes, and discounts when available.)
    (Generated by PCPartPicker 2013-08-29 15:39 EDT-0400)
  2. The power supply is fine. I was running 2 570's on 750W.
  3. For gaming it'll be fine.

    For GPGPU usage you would definitely want more headroom.
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