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Is 650w enough for 2 6970 in cfx? - Page 3

post #21 of 29
I would still recommend going with a 700-750W PSU. I don't like teetering so close to the max load like that.
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post #22 of 29
Thread Starter 
Thanks for all the replies. Will try the 650w for now and upgrade if need be.

Thanks!
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post #23 of 29
I'm drawing 395W from the wall using Prime 95 with a 1090T at 4.0GHz with 3 HD 6970's in tri-fire. At the same time, when running Unigine Heaven v2.1 at default settings except Anisotrophy at 16 and Anti-Aliasing at x8 at fullscreen 1920 x 1200, I'm drawing 822W's at stock 1175mV's Core Voltage with Core Clock at 950MHz.

With an AX1200 at the lowest 88% efficiency, that's 723.36W's... with 3 HD 6970's.

You're fine with 650W's for two.
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post #24 of 29
Quote:
Originally Posted by crUk;15328241 
As title says.
Discuss.
Please include your basis of calculation.
It will be enough, but the 6900 series becomes very power hungry when they are overclocked. So as long as you don't overclock, you will have more than enough power.

For a system that has one 6970 in it, AMD recommends a power supply that has a peak capacity of 550W. Most 550W peak-rated PSUs should be capable of continuously delivering 400-425W (approximately). AMD should have posted their Crossfire recommendation, but it's almost always about 100W more than their single-card recommendation (which means that they would recommend a 650W peak-rated unit). The 650W TruePower New is capable of continuously delivering 650W while its peak capacity is somewhere over 750W. This doesn't mean you can run it that high, but just compare that to what AMD's Crossfire recommendation should be of a 650W peak-rated PSU (even though they don't talk about it in this specific circumstance).

Quote:
Originally Posted by Sagaris;15328443 
Haha, you're right. The PSU Calc program just recommended me a 550W PSU. Funny, CFX 5870 reviews recommended at least 700W power supplies.
They're recommending PSUs that have a peak capacity of 700W, and most 700W peak-rated units should be able to continuously deliver 500 to maybe 550W.
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post #25 of 29
Please do 750. I tried lower and ended up with my PC turning off due to lack of power. Save yourself some time and effort.
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post #26 of 29
Quote:
Originally Posted by TwoCables;15331691 
It will be enough, but the 6900 series becomes very power hungry when they are overclocked. So as long as you don't overclock, you will have more than enough power.

For a system that has one 6970 in it, AMD recommends a power supply that has a peak capacity of 550W. Most 550W peak-rated PSUs should be capable of continuously delivering 400-425W (approximately). AMD should have posted their Crossfire recommendation, but it's almost always about 100W more than their single-card recommendation (which means that they would recommend a 650W peak-rated unit). The 650W TruePower New is capable of continuously delivering 650W while its peak capacity is somewhere over 750W. This doesn't mean you can run it that high, but just compare that to what AMD's Crossfire recommendation should be of a 650W peak-rated PSU (even though they don't talk about it in this specific circumstance).



They're recommending PSUs that have a peak capacity of 700W, and most 700W peak-rated units should be able to continuously deliver 500 to maybe 550W.


I learnt something useful on a Sunday evening. How refreshing. Thanks! +rep biggrin.gif
post #27 of 29
smile.gif
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post #28 of 29
Quote:
Originally Posted by crUk;15328289 
If you base it on this i think im good with 650w.

The graph probably shows power draw from socket.

596w AC * .80 80% effiency PSU =476w DC

Plus lets be generous 100w DC from CPU

476w+100w= 576w DC

That's pushing awfully close to its rated peak though according to the chart..unless you have a gold rated, I'd suggest against it...even then I think you should play it safe and just get a better PSU capable of handling such a load..I mean, you're spending the cash for 2 6970's (which is what? 600USD+?)...why not insure your investment by spending a little extra cash on your PSU...why even try to skimp out.
Edited by Allen86 - 10/16/11 at 11:27am
    
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post #29 of 29
Quote:
Originally Posted by Allen86;15331866 
That's pushing awfully close to its rated peak though according to the chart..unless you have a gold rated, I'd suggest against it...even then I think you should play it safe and just get a better PSU capable of handling such a load..I mean, you're spending the cash for 2 6970's (which is what? 600USD+?)...why not insure your investment by spending a little extra cash on your PSU...why even try to skimp out.
The 650W TruePower New's peak isn't 650W. It's likely over 750W because this 650W rating is talking about what it is capable of delivering continuously.

Plus, that 596W was measured at the wall. This means that if their PSU in their test system was 85% efficient during this test, then the system pulled about 506W from the PSU. wink.gif
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