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6850 Crossfire Power Requirement

Last response: in Graphics & Displays
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November 1, 2010 4:13:35 AM

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-cross...

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.
November 1, 2010 8:13:51 PM

600 watt is what manufacturers recommend.
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November 1, 2010 8:32:05 PM

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.
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Anonymous
November 1, 2010 8:38:53 PM

22 amps on the +12v rails is a bit low for my liking, but you could probably scrape by.
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November 1, 2010 9:53:55 PM

What about an i5-760 OC / 6GB Ram / 6850 CF / 320 HD. Will a Corsair tx650w be fine?
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November 1, 2010 10:17:26 PM

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.
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November 1, 2010 10:17:34 PM

nged72 said:
What about an i5-760 OC / 6GB Ram / 6850 CF / 320 HD. Will a Corsair tx650w be fine?

Yes!
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November 1, 2010 10:19:08 PM

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.
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November 1, 2010 10:38:04 PM

rolli59 said:
He is saying 22amps on each of the two 12volt rails.



...lets hope he is ;) 
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November 2, 2010 2:56:07 AM

@mzc, start your own thread.
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!