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Hey folks. I have a very simple setup, 2 Rockminer R-Boxes running 120Ghs each. The problem is I need  recommendation for a PSU. When I run one of them, I can just use one of the two pcie 6 pins and its perfectly fine. When I want to add the second one, the problem is that the second pcie plug is on the same power lead, which causes  far too much current to be pulled from that one lead and the wires get way too hot. I can use a dual molex to pcie 6 pin, but this is even worse since all the molex connectors are also on the same lead and the load problem is worse because molex only has 12v on a single lead.

What I really need is a PSU that has multiple pcie 6 pins on different power supply leads and I can't find one.

Anyone help me out?

No, what you really need is a PSU that doesn't use 20AWG wires for its PCIe 6-pins. 16AWG would be quite comfortable drawing that load, and you'll have no trouble finding it on a not-garbage PSU. I'm not trying to be rude, but I assume the one you're using was either fairly old, fairly cheap or both?

It probably won't be hard to track down a half-decent PSU with at least 25A on the 12V rail. Look for 80+ Gold rating. I'd recommend a server PSU as an affordable option but the power output is overkill and if you're running R-Boxes you probably want something quiet - which you're  not likely to find from server hardware.

Fart around in the Computer Hardware sales forum (https://bitcointalk.org/index.php?board=75.0) and see if anything pops up. I bet some of this guy's stuff (https://bitcointalk.org/index.php?topic=958566.0) would meet your needs.

yeah sidehack is correct

https://bitcointalk.org/index.php?topic=958566.0


that seller has

1-Corsair TX850M: This thing has been my workhorse, used since I started mining with no issues or downtime. $50
1-Corsair CX750M: Barely Used, was used for an ANT S1 for a month. Most Cables included. $50
1-EVGA 650G: Like new, in box, most if not all cables included $30


they are all good deals and will run your gear

Its actually a brand new supply, this one to be exact:

http://www.thermaltakeusa.com/products-model.aspx?id=c_00002031

I do completely agree that I need a heavier gauge wire and that's what the problem is. The actual supply has no issue providing the wattage. I'm going to take a look at the supplied threads and buy something beefier.

 

that psu is a multi rail piece of junk--- for your purposes.


http://www.newegg.com/Product/Product.aspx?Item=N82E16817153165&cm_re=tr-500-_-17-153-165-_-Product


it has 2x  12volt rails

1 is 17 amps the other is 18 amps  

that means 1 supplies 17 x 12 = 204 watts max
the other one supplies 18 x 12 = 216 watts max

grand total of 440 watts max


Tell me what state you are in I have a dozen psu's if you are close to NJ shoot me a pm.

I appreciate that because my only experience with PSUs has been with PCs and these miners obviously draw a lot of current. I'm going to ditch this and get something much better to fire up my second one. I think I'm going to go with one of the corsairs.

Corsair and Rosewill have given me great success.  Many people are fond of the EVGAs as well, but some of their models can get pricy.  The toughest PSU's I've found are the server PSU's though.  They're not for everyone, but the DPS 800 GBA's I started with would get crazy hot and keep on kicking.  You just couldn't kill them...

If you got the PCI lead that came with the R-Box, you can remove the wires from the plastic connector and replace them with the wires from the ATX 4+4 wires from the PSU. You are only going to power one R-Box in this manner and it will work safely without any negative impact on the original 6-pin PCI lead coming from the PSU already.
edit: If you don't have the lead from Rockminer then go to a nearby computer store and buy the empty plastic connector, you should find most carry an inexpensive pack of colored ones for the odd customizer.

I don't own an R-Box but it seems it draws around 120WAC (depending on PSU efficiency) and assuming the PSU is 85% efficient, that would still only equate to a load of about 102WDC or 8.5A on the PSU; 17A or 18A should be enough with a lot of headroom (assuming that the two PCIe harnesses of the TR-500 are on separate rails, of course).  But then again, there are good PSUs and there are cheaply made PSUs.  The good ol' Corsair CX500 workhorse should be ample to power two R-Box 100s.

Thanks everyone, all of the responses really helped.

I just bought a Seasonic X-750. It should be able to handle 4 of these rboxes without even sweating :)

Sounds like a good pick you will be happy down the line going with quality.   A psu frying a cord or something is no fun.  Also saves on electricity with a good rated PSU.

Got the new PSU hooked up, everything running nice and cool now. Thanks for all the help.

https://dl.dropboxusercontent.com/u/56844295/linked/RBox.jpg

Snazzy. I just got a bunch of those R-boxes in for repair last week, had never seen one in person before but they're nice little units. Glad you got everything up and going.
Just make sure there's enough clearance between the fans and the wall to pull in adequate air for cooling.