How many watts does my pc needs.

Hi i need to know what psu is going to be the best on my pc i am planning. crosfire two amd 7770 ghz the oc edition with vapor x tecnology as a mobo the asus p8z77 v pro and the intel core i7 3730k 3.5 ghz and maybe overclok it to 4.1as cooling the corsair h100i. The psu i have in mind is the corsair tx850w the one that is not modular. It would be really helpful if you can post the wattage of each part thank you .
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More about watts
  1. A 550w unit is really all you need for two 7770's. running two low end cards usually yields pretty poor performance gains though. I'd really recommend saving that $100 for a 760, or even a 7870 with a Tahiti chip instead.
  2. Or if you want a good new PSU a 550w G-series from Seasonic is good. If you want more power for future upgrades, I always recommend a 750w X-series they're the best on the market right now.
  3. Best answer
    Here's a nice Modular 620w for your future Crossfire , and it's made by Seasonic

    PCPartPicker part list / Price breakdown by merchant / Benchmarks

    Power Supply: Antec High Current Gamer 620W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply ($67.98 @ Newegg)
    Total: $67.98
    (Prices include shipping, taxes, and discounts when available.)
    (Generated by PCPartPicker 2013-08-01 21:53 EDT-0400)
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