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 1500http://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
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
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.