How much power will I need?

Hi all,
I was wondering how much power I will need in my soon to be built gaming rig.
My specs:
i5 3570k
ASRock extreme4 z77
8GB Corsair Vengeance
Antec Three Hundred Two
Disk Drive
Western digital caviar blue
Windows 7
Sapphire Radeon HD 7950 OC edition
Cooler Master Hyper 212 EVO

I have been looking at the XFX pro core 850w as I want enough power to crossfire which I may do so in the future, however I have heard, even with the crossfired GPUs, that this is still overkill.
The 750w model however is only £5 cheaper than the 850w model.
Thanks :)
2 answers Last reply
More about power need
  1. 200W per GPU
    150W for everything else

    Add 30% for safety margin, minor upgrades, etc. and my recommendation would be something north of 700W from the usual suspects.
  2. Thanks guys. Im gonna stick with the XFX pro core 850w one as it is bronze certified and has plenty of power for me to upgrade my system.
    On a side note, how well do you think this pc will run Crysis (1) and BattleField 3?
    Thanks again
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