PSU for OCd 920 + 5970?

I'm getting a 5970 and i7 920 for my new computer, and I'm going to be overclocking, but not to much (maybe about 3.5 ghz max).

And I'm wondering, is a 850w PSU enough? I did some research and, on load, the 5970 maxes out at just under 500w. As for the i7 920, I found a chat here that shows the wattage used at a few different OCd speeds. It says at 3.5 ghz it'll be using 211~ watts.
Besides the GPU/CPU. I'm using:

Motherboard: Gigabyte GA-X58A-UD3R
Heatsink: Coolermaster 212+
HDD: Seagate 7200.12 500 GB
RAM: Patriot Extreme 6 GB

Other then the question, is 850w enough? I'm wondering how close you can get to use all your power before it gets dangerous, and does using all 850w of a PSU run a risk of damaging hardware? Should I get a 950 or 1000w PSU to be safe if I'm going to be using a 5970 and OCing a i7 920?

Thanks :)
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More about 5970
  1. Hi, with a 700W PSU from a good manufacturer like Antec, PC power and cooling, Thermanltake, Seasonic, OCZ, Coolermaster or Corsair will be enough.
  2. cythx said:


    And I'm wondering, is a 850w PSU enough? I did some research and, on load, the 5970 maxes out at just under 500w. As for the i7 920, I found a chat here that shows the wattage used at a few different OCd speeds. It says at 3.5 ghz it'll be using 211~ watts.

    850 watt PSU is more than enough. Something like a Corsair 650TX (52 amp 12 volt rail):
    http://www.newegg.com/Product/Product.aspx?Item=N82E16817139005
    would be plenty.

    That 500 watt figure is for a complete "typical" system. Read the "211 watts" article a little more closely. That's also for a complete system:

    "We attempted to run our system as lean as possible. In our video and graphs below, the hardware represented is an Intel Core i7 920 2.66GHz processor, an ASUS Rampage II Extreme motherboard, 3Up x 2GB of Corsair DDR3 model TR3X6G1600C8D (cool video here showing 12GB at DDR3-1600), and an Intel 80GB “SSD” Solid State Hard Drive. The video card is an NVIDIA 6200 TurboCache GPU based card. All backed up with the incredibly efficient Thermaltake ToughPower 1200W PSU."
  3. Here are the official power requirements for the ATI Radeon™ HD 5970 video card.


    ATI Radeon™ HD5970 System Requirements:

    PCI Express® based PC is required with one X16 lane graphics slot available on the motherboard

    650 Watt or greater power supply with one 75 watt, 6-pin and one 150 watt, 8-pin PCI Express® power connectors

    850 Watt power supply with two 75 watt 6-pin, and two 150 watt, 8-pin, PCI Express connectors for ATI CrossFireX™ technology in dual mode


    The power supply recommendations are for an entire pc system.
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