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Is a 650 PSU enough for crossfire 6850??

Last response: in Graphics & Displays
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June 21, 2012 4:02:01 AM

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!!

More about : 650 psu crossfire 6850

a c 99 U Graphics card
June 21, 2012 4:13:28 AM

Yes, you have wiggle room for another 6850.
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a c 267 U Graphics card
June 21, 2012 4:17:43 AM

Also, check your +12V rails' amperage rating(s). A pair of HD 6850 should draw 20.4A maxed out. (245W/12V)
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a c 255 U Graphics card
June 21, 2012 4:19:09 AM

You are fine even with overclocking everything.
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Best solution

Anonymous
a c 117 U Graphics card
June 21, 2012 4:28:31 AM

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 :) 
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June 21, 2012 12:10:42 PM

thanks everyone for the answers.

about my amperage, the psu is a single rail, so the line has a cap of 53
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Anonymous
a c 117 U Graphics card
June 21, 2012 5:02:17 PM

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.
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June 28, 2012 11:56:54 PM

Best answer selected by basm4.
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