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Will this PSU support HD 6970 Xfire and i5-2500k OC?

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July 16, 2011 10:43:33 PM

The title asks it all:

Will the CORSAIR Enthusiast Series TX750 V2 750W support two Radeon HD 6970's in crossfire and a overclocked i5 2500k processor?
a c 105 ) Power supply
July 16, 2011 11:26:32 PM

Making assumptions about # of drives, fans, and connected devices, with 10% capacitor aging, http://www.extreme.outervision.com/PSUEngine shows 744W; so the answer is yes, but 850W might not be a bad idea.
July 17, 2011 12:26:53 AM

Quote:
Making assumptions about # of drives, fans, and connected devices


Ya it might've helped if I included that. :D  I'm planing on having one Samsung Spinpoint F3, a DVD burner, 1 200mm fan w/ LED, 3 120mm fans, and CPU cooler fan (120mm). Really no attached devices except maybe occasionally charging a MP3 player or something. I'd like to give it some room to breathe though, so I won't need to upgrade immediately if I add anything else. I'll probably end up going with the 850W.
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July 17, 2011 11:39:31 AM

A 750W from a trusted manufacturer will definitly work. However it will probably be at full load every time you play a game or something and thus its probably not a good idea. Get an 850w to be safe.

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a c 87 ) Power supply
July 17, 2011 1:03:45 PM
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It won't be at full load. And if it was, then surely 850W wouldn't have enough headroom itself to be desirable.

http://www.anandtech.com/show/4061/amds-radeon-hd-6970-...
http://www.legitreviews.com/article/1488/18/
These reviews show the power consumption of systems with two 6970s being between 560-600W, varying depending on whether it's running Crysis or Furmark. The Legitreviews one explicitly states that they obtained this number from using a Kill-A-Watt meter, so that will be the power consumption at the wall. Therefore the actual system power consumption in that case would be lower due to the efficiency of the power supply they used.

Both of the above benchmarks used Nehalem processors: an OCed i7-920 and an i7-970, which are more power hungry than Sandy Bridge CPUs.

So based on the two reviews above, I think that 540W is a worst case scenario for the maximum power consumption of Priox's build. Which is ~72% of a 750W PSUs capacity. Which is admittedly a little high and why I wouldn't dissuade someone from buying an 850W PSU for such a build, if they didn't already have a power supply that was large enough to be safely used.
I think it also depends how often his computer is on full load. If it is not very frequently then there is less need to get a PSU larger than 750W.
July 20, 2011 1:15:33 AM

My build is extremely similar, and I've settled on a Corsair HX850 based on user recommendations and my own research. I guess I recommend it to you as well :p 
July 20, 2011 2:25:58 AM

Best answer selected by Priox.
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