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Psu for 6870X2 crossfire

okay guy I have only just finished updating my PC a few weeks ago..
and then I go and get another present...that just so happened to be...
a new video card!

a powercolor 6870x2 (duel gpu 6870)

and damn! this thing is beast...and for $390
I think its time for my gtx 460 and 6870 to be sold
and other one of these to be purchased.

I feel like such a noob asking a psu question
within weeks of asking my last...

-question-
to run two of these beasts(overclocked) along with my
current hardware what wattage psu would I need
to be looking at..??

-current rig-
phenom 960t-cpu HEAVILY OC'ED
msi 870a fuzion-mobo
scsi raid card
-drives-
1tb sata II drive.
4x scsi 10k


I was hoping I would get away with using an 850... but when I think about it I dont like my chances..
7 answers Last reply Best Answer
More about 6870x2 crossfire
  1. Hello cainy1991;

    TechPowerUp measured the peak draw of a stock PowerColor HD 6870 X2 @ 245watts
    I think a premium 850W PSU could handle the max load OK. And I think the more typical gaming load would be well within the capability of a 850W PSU.
  2. Best answer
    On the other hand the maximum power draw (Furmark) was a hefty 353W and might be closer to the draw if you do something like a max OC on the GPUs.
    700W for the GPUs alone? That premium 850W PSU is sounding a bit light for a 'worst case' scenario.
  3. I would advice not going with 6870x2 crossfires as quad crossfire is not very good.
    the performance gain isn't the best when scaled pass 2 cards and you'd only see a real performance increases in artificial benchmarks.
  4. is it possible to use a single 6870 card to go tri-crossifre in this scenario?
  5. thanks for the feedback WR2.
    So I'm going by the understanding I should
    now start looking for a 950-1000 watt
    I'm roughly calculating the OC on my cpu to draw around
    130-150 @ 4.5 all cores unlocked (thinking of it as a X6 overclocked)
    in addition to your calculation of 706W for the GPUs
    bringing me over 850 already.. so if yeah definitely higher than 850.
    Thanks!
  6. Best answer selected by cainy1991.
  7. festerovic said:
    is it possible to use a single 6870 card to go tri-crossifre in this scenario?
    Im pretty sure it works because you can put a 6970 with a 6990 for tri crossfire.
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