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Author Topic: Multiple rails PSU for 4x gpu  (Read 798 times)
volver
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June 22, 2011, 06:59:18 PM
 #1

Hi everyone.
I'm new to this forum, so I can't post this topic in mining/hardware.

I'm looking for PSU to run 4x 5830 sapphire extreme cards.
I need to know if psu I have been offered can run this without problems.

It's this PSU: http://www.super-flower.com.tw/products_detail.php?class=2&sn=6&ID=20&lang=en
Superflower 1000R14HE from Amptac series. It has 6 12V rails, 4 are 20A and 2 are 35A. Overall it has 960W and 80A on 12V rails.
I'm not sure how those rails work, so would like to make sure this PSU can run 4x 5830.

Thanks in advance for help.
volver
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minor_miner
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June 22, 2011, 07:07:27 PM
 #2

Volt x Ampere = Watts

Check out the maximum Wattage your cards can pull and check yourself Wink

Hint: PCIe is able to deliver 75 Watts, a 6-Pin connector 75 Watts as well, an 8-Pin-connector 150 Watts.

Add all the connectors + the default 75 Watts from the PCIe and you have the maximum your card is physically able to pull, although of course the actual usage can be quite a bit lower.
volver
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June 22, 2011, 07:15:43 PM
 #3

2x 6pin + pcie is 225W per card then. 4 cards would be 900W.
But I have seen people running 4x 5830 even on Corsair TX850W psu.
I know, you said it can be lower.

I get it, but what about those multi rails?
I would be really glad if you could check cards/psu and tell me if that setup will work fine or not. I've been looking for psu for few days already. I'm tired since all OCZ 1000W are sold in my country and Corsair HX1000 are expensive. I can get that superflower 1000w for half the price.
minor_miner
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June 22, 2011, 07:33:16 PM
 #4

Sorry, but I'm not going to crawl the net for power consumption data of your 5870's now - if you can provide the numbers, I could help you calculate it.

The maximum Wattage you can hang onto one rail is, as said above Volt x Ampere.

Since the rails are all at 12 Volts, the four 20 Ampere rails are able to deliver 12 x 20 = 240 Watts each and the two 35 Ampere ones will be able to deliver 12 x 35 = 420 Watts each.


As pro-tip: Don't be a cheap-ass when it comes to PSUs - they are the most important and most udnerrated part of a PC, especially since you are planning a mining rig, for which stability and reliability is crucial.

The PSUs of well-known companies don't cost 200$ more for the sake of it, it's about the PSUs delivering constant 12V, even under heavy load, it's about the PSUs not frying your Mainboard and GFX-cards when there's an electricity hick-up, it's about the PSUs not starting to burn (!) like some of the made in china ones do - I guess you get the point, unless you want to risk your house being burnt down because you wanted to save 150 bucks.

Although I don't have a clue what's recommended in the US market, since I am from Europe, I can certainly say that I've never heard super-flower before. The fact that it's one of the most cheap ones, as you are implying, should get you a bit worried to be honest.

Recommended PSU-manufacturers for Europe are: Corsair, Enermax, Seasonic, Tagan, Cougar.

Also note that your PSU should not run above 85% of it's maximum for 24/7.

Highest efficiency is at 50% by the way.
volver
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June 22, 2011, 07:43:18 PM
 #5

Thanks a lot for answer. I think I understand it now. 12V x 20A = 240W, so 5830 should run well even if it would require full 225W.
I'm from Europe as well btw.
There are no new Superflower PSUs available in my country. The one I have been offered isn't new either.
If you read reviews of that psu it seems to be very good. Quality one, despite this "cheap" look. It also has 80+ bronze award.
Thanks again for help, I'll be getting this PSU.
minor_miner
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June 22, 2011, 07:45:24 PM
 #6

Glad I could help.

Post again if you have any questions!  Wink
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