You are putting these in a data center, why are you wasting money on case fans? You don't need them to be quiet, so why not just buy some badass 120mm deltas? I know of a few that will push 200+ cfm. If you jump to 24V somehow, 600+ cfm from a single fan is possible.

Did you seriously just quote a post from around a year ago to tell this person something they likely already know? 

Block eruptors make hardware errors when they are working, the percentage depends on the mining software used.

With such easy access to the needed power, is there any particular reason you aren't using server power supplies for the cards?

If you ever need help with custom rackmount cases, let me know 

With two PSU's it is entirely unnecessary to turn them on simultaneously. A screwdriver still works fine  

Pretty much the same as me, I picked up a few big EVGA supplies before they got expensive, luckily. Been working on putting together the server supplies lately, about tired of crimping after one rigs worth of cables already. I've been de-pinning the molex to pci-e adapters that come with GPUs, so the cost is in wire and crimp terminals. Pretty cheap, in other words. 

Just wish I knew a faster way to do it 

 

Easy, with a screwdriver.

Or, you can make your own if you really want. Since my machines have auto start scripts, I wanted reset buttons and status leds. I ordered everything from digi-key.



You can see the grey cable behind the angle aluminum, it runs under the board to the front panel header.

I even built a rpi and a set of reed relays. I will soon be able to remotely reboot any of my rigs



Works kinda like this...

http://www.youtube.com/watch?v=JXvjqIuI4rg

The mobo is a gigabyte g1.sniper 3, don't know if they are still around any more. That rig was built before BTC GPU mining was dead.

How much did it cost? Stupid question, as I highly, highly doubt you'd ever be able to recreate it. It paid for itself, and then some.

The USB riser cables came from China directly, I ordered them in bulk. There's really only one or two suppliers, last I checked.

There are a few guys who sell them on the forum here, you may look around the marketplace a bit and get lucky and find a local seller.

I did the very same thing at my work around a year or so back, it was great experience for the farm I'm running now.

It's a very good thing you've hid it, and if you haven't already I would not tell your coworkers what exactly it is you are doing. In a year, they may just be jealous haters, saying you've got preferential treatment...



Here is 1/3 of my farm that I've managed to get deployed so far. My rigs love the environment, it stays a steady 60 degrees or so, and my cards stay around 65-70c at the most.

There are 12 290's, 6 280x, and 6 7950 in this picture. Not shown are 12 more 290s I am "proving out" at home, as well as a few other misc cards.

My net hash rate is ~30M 

UEFI bios on/off. For W8, apparently according to what I read in the manual. I leave my little blue lights on for fun as well, no effect either way in Linux/W7. I have a bunch more sapphire 280x dual-x cards w/o that blue button as well, only has a little switch like we are all used to.  

It looks like something on the other end of that riser cable was shorted out to a ground. Those first three pads/wires on the nearest side are 12V power, two of the three on the other side are also 12V. The 4th pad in on either side is a ground, none of those 12V pads can touch any of the ground pads or you'll see what you've got there.

There are no different risers, they all do the same thing basically. You may have just got a defective one.

The GPU stops working at 100c, but the voltage running all through that wood frame don't give a damn.

I'd be more worried about that setup breaking and dropping 5 grand on top of another 5 grand of hardware before I was worried about fire, though.

None of those cards dump heat out the back, they just toss it out whichever way they feel like. Look at the cooler design on any 280x (or 7950TF3) you'll see what I mean.

Only the ref cards really exhaust out the back.

Everyone has trouble with 290's. If you aren't recompiling cgminer or using one with a pre-modified ADL library you probably won't get them to work.

The 290 has powertune 6, or something like that. The 280 uses powertune 5, which is what the 79xxx series used. Cgminer/bamt are built around powertune 5, so the calls and commands the 290 expects never come. This is why it'll bluescreen out on windows if you press "q" to quit.

280x's didn't work on BAMT for over a month, not unless you recompiled it with the 13.11 beta drivers yourself. The 290 situation is similar, but worse.

Dang, almost exactly what I am looking for. Mind sharing some terms that might save me some google-fu time?

Thanks!

No prob, glad to help!

You aren't using a recompiled cgminer version? Do you have fan and temp displays or control? You are the first person I think I've seen who's got more than 4 working, though I figured it should be possible  

If you don't have fan/temp control, have you seen this page yet?
http://www.ohmpie.com/mining-on-an-r9-290-in-linux/

I have 6 290's I've been waiting to set up, but I don't have enough 120v power just yet. Hopefully this weekend...

Yes, stock voltage. These are running 995/1500, w/ 20% powertune. Pretty stock settings everywhere else, TC32765 I want to say?

It's a beta multipool (why I edited out so much of the pool details) between the high pool diff and constant switching I think I'm loosing a lot more than I need to. The payouts seem to compensate though, so we shall see if I let that continue. I get much closer to 1% on the pool I usually mine at, though I only let it go for 2-3 hours like that last night.

Thanks! This is a z77a-GD65 board, so I may try adding a 7th card for the hell of it. I've got 16 more on the way already. 6mh/s, from one rig? Have to try 

I have a pair of EVGA supplies under this one, a 1300G2 and a 1000G2. The 1300 runs the board, riser cables, and three cards, and the second 1000W runs three cards and a SSD. I'm not exactly sure of power draw yet, but I'm sure it's brutal.

I guess 290's have to use signed bioses, or at least they did? Seems someone may have found a way to load voltmodded bioses to 290's, certainly keeping an eye on that thread 

I plan on either buying a kill-o-watt on my way home from work, or swapping in one of the 1500W evga supplies I have with the built in load meter if I can't find a kill-o-watt. I'd rather not mess with that, since the "supernova" software only runs on windows...

6 290's, XFX "black edition" cards 

I also have two of those 1500W supplies, and they are kick ass! Single/multi rail in one, load meter, nice quality cabling... I like using them to measure wattage draws on cards in real time, then I'll swap over to smaller PSUs when I feel everything is in safe running conditions. My only complaint is it's loud and you can hear the APFC clicks a lot when running 1200W of water cooled GPUs. Loudest thing in the build, by far 

Are you running all 6 of those 280x's on one. I know it'll do it on 220, but I never really thought it would run all 6 at full throttle.