That's pretty cool.  10A is just short of what I need though, I'd have to get two...

[edit] actually, my rigs pull about 6.5A.. won't work for me

The stanzas in your Xorg.conf are more or less device-specific.

I don't use linuxcoin and don't know it's internals, but in Ubuntu you can just run:

sudo DISPLAY=:0 aticonfig --initial -f --adapter=all

If linuxcoin's sudo isn't setup / gives you an error, become root and run it directly without the sudo.

Alternately move to Texas.  The moment said trespasser trespasses, you can just shoot 'em.

The amount of people trying to get under my skin today amazes me.

It was a freakin joke.

What motherboard?  That PSU should be plenty beefy enough, and has a single rail, so unless you've melted your connectors somehow it should supply plenty of power.  Make sure connections are snug of course.

If you're using an older mobo it could be a problem supplying the 75W PCI-e slot power..

Does the card behave this way if you take the 6970 out?

Man, I got options.

That would be pretty easily doable with an arduino or similar, and gets rid of the relay-failure problem.  Its also a hell of a lot safer, we miners get enough high-current play in the breaker box!

X10 isn't a bad idea either, I forgot about those

Something like this SSR controlled power strip would work pretty well too, fairly cheap outside of the labor involved, but choosing your own SSR means you decide the max-current and voltage specs..

http://www.instructables.com/id/A-USB-Power-Controled-Plug-Strip-With-Isolation/

This $23 SSR + crap I have laying around could get the job done:

http://opto22.com/site/pr_details.aspx?cid=3&item=120D25


The only problem I see with this is it introduces a dependency on whatever device is supplying the DC current to the switch..  one more possible failure point..

That's the ticket, but at 6A max current I don't think it'd hold up too well against my 4x gpu rigs.  Looks like they've got a few IP controlled switches with built-in web pages, etc, but they're a bit pricier..

I've seen quite a few posts where people are controlling their farms remotely, often 10s or 100s of miles away, asking about automating reboots, cycling power with automated timers, etc.  And sometimes miners just lock up hard, and there's nothing to do but flip the power switch.  

It occurs to me the ideal solution would be computer/remote/network controlled relay switches, allowing you to power-cycle your miners from anywhere you please.

I've done some research on solenoids, solid-state optical relays, etc, that look like they could be pretty easily wired and driven from a serial port or even USB, however my EE skills are severely lacking.  Something pre-packaged in a <$50 range would be ideal, but I'm not finding any 'consumer friendly' options.  I'm willing to pull out the old soldering iron if I can find a good guide to follow, but time is precious.

Is anyone using such a thing they could recommend?

You might want to look at adding a CX430 or such to this - I had a (probably identical) Corsair 750W pulling 800W at the wall and it was just a little too much for it.  It handled it OK, still ran all of my components without any issues, but the PSU got really warm and started making an audible 'click' every few seconds.  Removing one of my cards from it's rails got it back to it's happy place.

You're probably just fine at 750W at the wall, especially if it's not getting too warm, but just forewarning you might be near it's limits.

I've heard tell that you might have to remove the ATI drivers before rebooting into Windows, can't confirm since I'm a linux guy.  I had setup a Win7 system for flashing my 6950s and had the exact same issue, but didn't have time to dig into it then. 

From what I've read all of the 6xxx series cards have this memory clock limitation.  The value is 125mHz, however, so at 900mHz GPU you should be able to use 775mHz memory clock.  At least that's the case on my 6950's, which I run at 885/760.

I've also heard tell that flashed 6xxx series cards that won't boot into Windows work in linux just fine, I've yet to try this either however.  I need to pull one of my cards soon so I'll give that a try in a few days.

1000W is plenty.  My rigs are running 2x 5830s and 2x 6950s, my 5830s all run at 1020/300 (~320mh/s), and the 6950s are bumped to 885 (from 830 stock).  Both cards are using stock voltages.

Each rig has a 750W for 3 of the cards and a 430W powering the system + 4th card.  All said and done I pull 800W exactly at the wall - ~400 on the 750W PSU and 200 on the 430W.

With heavy overclocks, and especially with voltage increases, you'll push 85% of that 1000W which should be pretty comfortable for the PSU and put you in a good spot for power efficiency.

Short answer, yes unless the rest of your system is drawing considerable power.

Ah, didn't realize - linux guy and not much of a gamer, I assumed 'crossfire compatible' was chipset independent.  ATI/AMD dropped the ball and left a lot of value on the table on that imo if 5xxx and 6xxx can't be paired.  Looks like I need to buy some more 5830s for the epic 8-way crossfire I was planning when mining goes kaput

Well congrats, and if I can give you some advice - put that money in a college fund instead.  You'll thank yourself so hard in 18 years you'll knock a hole in your chest from patting yourself on the back.

I admit it's been a while since I've messed with CPU overclocking but that's really the first I've ever heard of such a thing.  From what I do understand of modern memory controllers, specifically their decoupling of CPU/memory clocks and voltages, I can't see why it would be a problem.  Whatever, OT.

I can say if you're building a gaming machine, build a gaming machine.  Unless you're mining on it 24/7 it's not going to pay for itself anytime soon, and from the specs it sounds like you've got a bit of cash to throw at it.  There's nothing more disappointing than going 'budget' or making compromises when you don't need to.

That's the spot temp at the sensor, your case temperature won't immediately fall 20C, nor is the inside of your case reaching 80C under load.  Or maybe it is.  If it is, you've got some problems

Why would this effect system stability?  A bad DIMM perhaps, but as long as the OS can address all the memory there should be no stability hit..

Even if you had a beefy enough power supply, running all 3 in an enclosed case you'd have some major heat issues. 

I'd ditch the 5850 if mining is a secondary concern for you, though.  Gaming-wise you're going to get some incredible performance out of the 6970+5970 crossfired.  The 5970 alone is probably 'more than you need' if you were happy with the unlocked 6950.

I setup my mining rigs in the garage connected to a wifi-g bridge before moving them to the server closet, works like a charm, and no effect on hashrate that I could detect.