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Suffiecent power?

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September 6, 2010 12:27:47 AM

Would a 650W XFX XXX be suficient for powering 2 GTX 470's in SLI?

Intel Core i5 750, Lynnfield 45nm
MSI P55-GD80
Scythe Yasya High Performance Ultra
G.SKILL RipJaw 4GB (2x2GB)

Ther above is the rest of the rig

More about : suffiecent power

a b ) Power supply
September 6, 2010 12:43:13 AM

Yes. Should be fine.
September 6, 2010 2:15:17 AM

I wouldn't to be honest. These cards are huge power suckers. At peak power draw your looking at around the 700w range without any other components.

I don't like nearing the peak of any PSU to be honest, I prefer to have some headroom for safety reasons.
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a c 144 ) Power supply
September 6, 2010 7:48:45 AM

A pair of GTX470's will use about 28 amps. Figure 10 amps for the CPU. Assuming 1 hard drive and 1 optical, the rest of the system will use less than 120 watts. I'm estimating about 560 watts.

That's around 85% of capacity. The XFX PSU is a pretty good PSU. It can handle that. But I like to operate my power supplies a little more conservatively. I would put in a good 750 watt PSU.
a b ) Power supply
September 6, 2010 11:34:56 PM

I would not recommend a 650watt PSU for that. It technically would be enough but you would be cutting it very close to the limit and you don't want that. PSU's in my opinion should always be a little overkill for their system just to be on the safe side as your entire computer's life literally lies in its hands. I would say a 700watt minimum and I'd recommend a 750watt if possible.
a c 248 ) Power supply
September 7, 2010 1:09:10 AM

I took a look at several competent technical reviews. Results varied based on system configuration and testing methods. It appears that a high quality 750 watt power supply would be just about right.

Corsair and Seasonic are two brands that have a reputation for high quality power supplies that consistently earn high marks in technical reviews. They are reliable, stable, and come with a 5 year warranty. Some of the newer models come with a 7 year warranty (in the USA).
September 7, 2010 10:57:05 PM

thank you for all the replies guys
a b ) Power supply
September 8, 2010 2:04:07 PM

I hate to say this, but while more overhead capability would be desireable, the original question regarding the XFX 650W's suitability is still "YES".

Regardless, take a look at the ratings for each of the recommended PSUs before you buy. Both the Silverstone and the Corsair (by a huge margin) have much better ratings than the OCZ.

What is your budget? That will drive your decision greatly. If money were no object (can anyone ever really say that?), I would recommend a Seasonic (as JohnnyLucky indicated), they are truly excellent PSUs.

http://www.newegg.com/Product/Product.aspx?Item=N82E168...
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