6850 Crossfire Power Requirement

Hi

I'm wondering whether my 620W, 22amp (on the 2x12v rails) will be able to run 2 x 6850's in crossfire.

I will probably be over-clocking to prevent bottlenecking if there is any.

Going by this:

http://www.guru3d.com/article/radeon-hd-6850-6870-crossfirex-review/4

It states that 2 6850's in Crossfire, with an overclocked processor, cold calthode lights etc, with GPU in FULL Stress uses 393W.

That can't be right can it?

If it is then I presume I have nothing to worry about.
8 answers Last reply
More about 6850 crossfire power requirement
  1. 600 watt is what manufacturers recommend.
  2. Trust the all-knowing Guru of 3D.
    As they usually say, their numbers represent a worst-case scenario and your power requirements will generally be less than their fully stressed system. The 6850's are very thrifty when it comes to power usage.
  3. 22 amps on the +12v rails is a bit low for my liking, but you could probably scrape by.
  4. What about an i5-760 OC / 6GB Ram / 6850 CF / 320 HD. Will a Corsair tx650w be fine?
  5. nged72 said:
    What about an i5-760 OC / 6GB Ram / 6850 CF / 320 HD. Will a Corsair tx650w be fine?

    Yes.

    Here is Guru3D's power supply recommendation:

    Radeon HD 6850 x1
    On your average system the card requires you to have a 450 Watt power supply unit.

    Radeon HD 6850 x2
    A second card requires you to add another ~130 Watts. You need a 650 Watt power supply unit.

    Radeon HD 6870 x1
    On your average system the card requires you to have a 500 Watt power supply unit.

    Radeon HD 6870 x2
    A second card requires you to add another ~150 Watts. You need a 700 Watt power supply unit.
  6. nged72 said:
    What about an i5-760 OC / 6GB Ram / 6850 CF / 320 HD. Will a Corsair tx650w be fine?

    Yes!
  7. Anonymous said:
    22 amps on the +12v rails is a bit low for my liking, but you could probably scrape by.

    He is saying 22amps on each of the two 12volt rails.
  8. @mzc, start your own thread.
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