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Is a 650 PSU enough for crossfire 6850??

Howdy,

I currently have a i7-2700k, 1 HDD, 1 SSD, 1 DVD+/-RW & 1 Sapphire 6850 (and more fans than I can count).

I have the Corsair TX650-V2 and I was wondering if I have enough wiggle room to safely crossfire a second 6850 assuming no overclocking.


Thanks!!
7 answers Last reply Best Answer
More about crossfire 6850
  1. Yes, you have wiggle room for another 6850.
  2. Also, check your +12V rails' amperage rating(s). A pair of HD 6850 should draw 20.4A maxed out. (245W/12V)
  3. You are fine even with overclocking everything.
  4. Best answer
    Radeon HD 6850 & 6870 CrossfireX review
    Measured power consumption two 6850 cards

    System in IDLE = 186W
    System Wattage with GPU in FULL Stress = 393W
    Difference (GPU load) = 207 W
    Add average IDLE wattage x2 ~ 19W (ATI specified)
    Subjective obtained GPU power consumption = ~ 245 Watts
    you're fine :)
  5. thanks everyone for the answers.

    about my amperage, the psu is a single rail, so the line has a cap of 53
  6. basm4 said:
    thanks everyone for the answers.

    about my amperage, the psu is a single rail, so the line has a cap of 53

    you're absolutely fine.

    12 volts @ 53 amps is 636 watts.

    now if you notice that is only 14 watts away for the rated total output; it means that is the maximum for just that rail without including the 3.3 and 5 volt rails. but do not worry; it will not be a factor unless you want to SLI some power hungry cards like GTX 480s!

    your set up needs 245 watts @ 12 volts is 20.5 amps as posted before.
  7. Best answer selected by basm4.
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