Which power supply to use for i7 920 OCing?

Hi there,
I am buying a i7 920 and would like to overclock it to 3.6 GHz. I am planning to buy Antec or CoolerMaster case. Will the built in power supply suffice or should I buy external PS?
By the way, how many watts of power will it take to OC to 3.6ghz. Is it 650 or 750?

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More about which power supply ocing
  1. First tell what's the wattage of the psu coming with that case.
    Generally the psu's that come with cases are not that great.

    And which video card are you running?

    I think you will need a 850w+ PSU for OCing that with a decent video card.
  2. My parts are

    i7 920 - Tobe OCed to 3.6 Ghz
    Asus P6T
    Quadro FX 1800
    Patriot 6x 2GB 1333
    WD Black 2X 640GB

    I am just stuck with choosing the right PSU. Will any Cooler Master or Antec have a 850W default PSU?
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