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Author Topic: Best PSU for Mining Rig: Single or Multiple 12V rails?  (Read 8868 times)
stellan0r
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August 21, 2011, 03:01:51 PM
 #1

Hi everyone,

at the moment I am trying to figure out what the best PSU for my purpose would be.

I need to decide between the two following models:

Corsair AX1200
http://www.corsair.com/power-supply-units/professional-series-gold/ax1200.html

vs.

Enermax MAXREVO 1500
http://www.enermax.co.uk/maxrevo


The Corsair is well known to many of you, as it is one of the best high-class high-power PSU's out there, with a strong as hell 104A rated single 12V rail.

The Enermax MAXREVO, their new flagship PSU, is even stronger and has a superior build quality, too.

The difference is, the MAXREVO features 6x 12V rails, each rated with 30 Amps (reviews have shown more power can be drawn anyway). 4 of these rails can be used to power GPU's.

In the following tech-sheet you can see how the rails are distributed amongst the connectors:
http://www.enermax.co.uk/fileadmin/enermax/content/produkte/netzteile/maxrevo/datasheet_maxrevo_eng.pdf


The question now is, which PSU would be better for a mining rig with either 5 GPU's (like 5x 5870) (+ Corsair PSU) or 6 GPU's (+ Enermax PSU)?


Both PSU's have a 90%+ efficiency at 50%+ load.
The Enermax offers native PCI-E cables for 4 Radeon 5870 cards, the Corsair offers only connectors for 3 cards. The other 2 cards would each have to be attached with adapters from the molex cables on both PSU's.

For the connection to the Enermax and it's 4 available rails, you could attach 2 GFX cards natively to rail 12V3 and 12V5 each and 1 natively to 12V4 and 12V6 each. One more for V4 and V6 each via molex adapters (see datasheet mentioned above). Each rail has at least the power to transmit 360W (30A * 12V), + 75W more from the PCI-E slot on the mainboard (which is hopefully not needed Wink )


So, is there an answer to the question which PSU is better, or is it just to my taste and money (as there is a nearly 100€ price difference between the two in Germany)?
Is there any real advantage of single rail over multiple rail and vice versa in a mining rig this big at all?


Btw, the PSU's offer 5 (Enermax) and 7 years (Corsair) of warranty, so you can be sure you have quality in your rig.

And test have shown that the Corsair AX1200 can easily run at a load of 1400W+ for a very long time, and the Enermax in the 1350W version can even withstand 1600W+, this one shuts down if you try to get 1750W out of it Wink You can only imagine how much power the 1500W MAXREVO can handle.


If you need more information about single vs. multiple rail PSU's, check the following post:
http://www.jonnyguru.com/forums/showthread.php?t=3990


Not to forget, the other parts of the rig will be a Sempron 140 + Mainboard, 2-4 GB RAM, a 2.5" HDD, a couple of 120mm fans. All together not more than 100W.

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stellan0r
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August 23, 2011, 12:59:12 PM
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no opinions? just get the cheapest and hope it doesn't burn down your house?  Huh  Cool

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August 23, 2011, 01:32:10 PM
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no opinions? just get the cheapest and hope it doesn't burn down your house?  Huh  Cool

I vote for Enermax, best cost X benefit.  Smiley
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August 25, 2011, 01:04:46 AM
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no opinions? just get the cheapest and hope it doesn't burn down your house?  Huh  Cool
I use Corsair PSUs (not as powerful as yours, though) and am very happy with them.

Personally I *much* prefer single 12V rail PSUs because I'm too lazy to rewire the multi-rail units when the connectors aren't ideally placed.

For example, I recently acquired an Antec 850W unit on special offer. It was 'semi-modular'... and the pictures showed modular connectors with the 12V rail number stamped next to them. There were 4 connectors, so I assumed that all 4 rails could be tapped, and hence I could use most of the 850W available.

When the PSU arrived, I found that Antec had assigned the ATX logic board connector and the two CPU connectors (one 4-pin, one 8-pin - waste of two cables there) to the first rail, with no way of attaching any other peripheral to the first 12V rail. So I've got 30A (or whatever) dedicated to my underclocked, one-core-only-active low-spec CPU, and the logic board. Arse.

So the 850W supply really only gives me 650W *usable* 12V feeds to GPUs. Sad

With a single-rail PSU, there's no messing around like this. There are ways to remove pins from (say) the second CPU power feed, and wire them into a PCIe power plug, but I don't want to mess around doing this.

I'd go for the Corsair. Smiley

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November 03, 2013, 04:36:54 AM
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Servus und Moin Moin,

Which power unit did you go with?


My recommendation
Always go for the multi rail... it is just way safer, especially when you are under full load "all the time".

the MaxRevo 1500 Gold has been relabeld to 1500 Platinum (Platimax), since in EU (with 240V) it is more efficent... (MaxRevo is "discontinued")


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November 03, 2013, 08:21:46 AM
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This one is cheap an very good, but just for max. 4GPUs...

http://www.coolermaster.com/product/Detail/powersupply/v-series-psu/v1000.html

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November 03, 2013, 01:16:22 PM
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Which power unit did you go with?


lol, 2 years later...  Cheesy

Tip, check the post dates before you end up reviving a long, long, long dead thread.  Shocked
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November 03, 2013, 04:40:11 PM
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I saw that the thread was 2 years old.

but the information still holds.
its the same products in the market, nothing better has come out in 2 years.

and the information is still relevant for people "starting out" today...



so think first, before you make "tips"...  Cheesy
your post contained no information, so you could also go back and delete it!
and btw. reving old threads is better than spammin new ones!
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