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[Help] The right PSU for crossfireX

Last response: in Graphics & Displays
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July 11, 2012 6:55:45 PM

Hey there, I was just wondering if that PSU from Corsair http://www.newegg.ca/Product/Product.aspx?Item=N82E1681... would be able to handle two Radeon HD 6850 in crossfireX.

P.S.: I have a Phenom II x4 970 BE, if that matters...

Thanks alot guys ! :) 

More about : psu crossfirex

July 11, 2012 7:03:37 PM

Should be close- http://www.bit-tech.net/hardware/graphics/2010/10/22/at... so you would be using about 500 in gfx cards at max and have 100 left for whatever else. I know I would be a bit worried though. Upgrading to a 750 would be enough but you should never undersell on available power. I'd go for something like an 850 if using xfire or sli no matter what cards.
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July 11, 2012 7:09:03 PM

Well I read and article about ''Crossfirering'' two Radeon HD 6850, and it said a 650W PSU. Though as this one is a Corsair, and that these PSU are always under rated in there wattage, I thought maybe that would be enough.

Thanks for your fast answer :) 
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July 11, 2012 7:16:07 PM

This may be true about them being under rated but I would never trust it to be.
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a c 255 U Graphics card
July 11, 2012 7:38:16 PM

AMD recommends a 550w power supply for 2 x HD 6850s in Crossfire. That assumes you have a generic power supply.

http://www.realhardtechx.com/index_archivos/Page362.htm

As we can see here a system with 2 x HD 6850s at max load consumes 393 watts.

http://www.guru3d.com/article/radeon-hd-6850-6870-cross...

Quoting from the article:

"Our test system is based on a power hungry Core i7 965 / X58 based. This setup is overclocked to 3.75 GHz. Next to that we have energy saving functions disabled for this motherboard and processor (to ensure consistent benchmark results). On average we are using roughly 50 to 100 Watts more than a standard PC due to higher CPU clock settings, cooling, additional cold cathode lights etc."


The Corsair 600CX will work just fine for Crossfiring 2 of those cards with your system. It is however from Corsair's budget line. That rebate makes it worth it though. If it didn't have the $20 rebate I could have found you a better model for the same price.
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July 11, 2012 11:44:03 PM

Well, in that case, I have a OCZ Fatal1ty 550W. Would that do the trick ?

Thanks alot !!
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a c 255 U Graphics card
July 12, 2012 12:10:24 AM

yasio said:
Well, in that case, I have a OCZ Fatal1ty 550W. Would that do the trick ?

Thanks alot !!



With 37.5 amps on the 12v rail that OCZ should be just fine.
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