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Is this 850w good for SLI 570 and rest of system?

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July 14, 2011 4:12:24 AM

XFX Core Edition PRO850W (P1-850S-NLB9) 850W ATX12V / EPS12V SLI Certified CrossFire Ready 80 PLUS BRONZE Certified Active PFC Power Supply
http://www.newegg.com/Product/Product.aspx?Item=N82E168...


Other Parts

i5 2500k OC to ~ 4.3 - 4.5mhz
8GB DDR3 RAM 1.5v (G.Skill 8-8-8-24) http://www.newegg.com/Product/Product.aspx?Item=N82E168...
3 7200 RPM Hard Drives (1 spinpoint F3 and 2 drives from old computer)
Sound Card
4 120mm case fans, 1 120mm CPU cooler fan

aaaaand...

Two GTX 570s?

What if I OC the 570? Or 2 6970s instead?

I did try searching around the internet (answer uncertain) and using this PSU calculator: http://extreme.outervision.com/PSUEngine

This calculator recommended 849w with 20% "capacitor aging" and 4.5 OC on the CPU, so no OC on GPUs I suppose. But I don't know, I'd really like to hear some real info instead just a calculator like this. Plus I saw this very same calculator linked from a PSU manufacturer's site, which makes me wonder if its rigged to recommend high wattage in order to bump sales.

Thank you

EDIT: Two 6970s came it at 875w, not sure why but I was under the impression that they would be less than the 570s. Probably thinking of 6950s.

Best solution

July 14, 2011 4:35:54 AM

Yes, an 850W PSU will be fine with your crossfire or SLI setup. The main concern is the 12v rails. It's better to have a single 12v rail if you are pushing the PSU. And an XFX is of high enough quality (so they seem, I don't use them though) that it isn't going to be "over rated".

Hope it helps. And you will have plenty of room to OC your cards/proc./RAM.
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July 14, 2011 4:55:05 AM

Thank you, puttsy.

You know, its a matter of if more or better is recemmended, then OK. But if not, I don't want to pay for unnecessary capability.
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July 14, 2011 6:18:41 AM

I would suggest you to go with either
seasonic x850
corsair ax850
antec high current pro 850
corsair hx850
xfx xxx850 black edition
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July 24, 2011 4:29:06 AM

Blizzard Xtreme said:
I would suggest you to go with either
seasonic x850
corsair ax850
antec high current pro 850
corsair hx850
xfx xxx850 black edition



I understand that all of those are objectively better than the XFX I posted, but they are also considerably more expensive.

Why do you recommend the extra expense? Is the original XFX inadequate?

Thanks
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a b ) Power supply
July 24, 2011 6:29:10 AM

that xfx is perfect for sli 570/580 yeah you good to go its not modular but thats just a minor gripe
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July 24, 2011 9:01:58 AM

Very good. Thank you.

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July 25, 2011 1:48:10 AM

XFX are one of the better, lesser expensive GOOD PSU's. Personally I wouldn't buy one but that is because I LOVE my Corsair PSU's and wouldn't do anything else. I always consider the investment of it though. The XFX will be a nice, solid, powerful consumer grade unit that will get you plenty far in your adventures.
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July 25, 2011 2:28:54 PM

robpaul said:
XFX Core Edition PRO850W (P1-850S-NLB9) 850W ATX12V / EPS12V SLI Certified CrossFire Ready 80 PLUS BRONZE Certified Active PFC Power Supply
http://www.newegg.com/Product/Product.aspx?Item=N82E168...


Other Parts

i5 2500k OC to ~ 4.3 - 4.5mhz
8GB DDR3 RAM 1.5v (G.Skill 8-8-8-24) http://www.newegg.com/Product/Product.aspx?Item=N82E168...
3 7200 RPM Hard Drives (1 spinpoint F3 and 2 drives from old computer)
Sound Card
4 120mm case fans, 1 120mm CPU cooler fan

aaaaand...

Two GTX 570s?

What if I OC the 570? Or 2 6970s instead?

I did try searching around the internet (answer uncertain) and using this PSU calculator: http://extreme.outervision.com/PSUEngine

This calculator recommended 849w with 20% "capacitor aging" and 4.5 OC on the CPU, so no OC on GPUs I suppose. But I don't know, I'd really like to hear some real info instead just a calculator like this. Plus I saw this very same calculator linked from a PSU manufacturer's site, which makes me wonder if its rigged to recommend high wattage in order to bump sales.

Thank you

EDIT: Two 6970s came it at 875w, not sure why but I was under the impression that they would be less than the 570s. Probably thinking of 6950s.


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

$124.00 after mail-in rebate...

Good luck
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July 25, 2011 2:40:32 PM

The XFX PSU that you have shown in the first build is very adequate. While it is only 80+ Bronze and not modular, it is still a highly recommended PSU.

XFX PSU's are sometimes overlook because of the brand, but the OEM is Seasonic which produce some of the best (if not the best) PSU's on the market. And at the 850W capacity, I have no doubt that this will do 2 x 570's and the rest of your system just fine.

If you want some further detailed reviews on this PSU, you can check out this review from JonnyGuru, and HardwareSecrets (some of the most reputable PSU reviewers)

JonnyGuru: http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story&reid=217
HDS: http://www.hardwaresecrets.com/article/XFX-PRO-850-W-Power-Supply-Review/1205

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July 25, 2011 3:55:11 PM

Thank you everyone. I finished by build yesterday and all went fine.

Well, except maybe my application of thermal paste. I think I may have botched that. Oh, and I mistakenly installed windows on the wrong partition, so I get to redo that too.

That's what I get for pushing to 2 o'clock in the morning to finish.

But everything works, so I can now rest easy.

I wish I could select multiple "best answers", but I can't so puttsy gets it for being first.
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July 25, 2011 4:00:53 PM

Best answer selected by robpaul.
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