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Author Topic: What I Learned from Building 3x5850 Rigs; May 2011  (Read 8214 times)
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May 17, 2011, 06:49:47 PM

>I will disclose my adventures and learnings here, for the benefit of fellow Bitcoiners.
thanks,  Cheesy  from your name I had always thought you had a thousand ASICs, but then it's A. only =)

> I will disclose my adventures and learnings here, for the benefit of fellow Bitcoiners.
or... competitors

I could not stand the temptation any longer, too, and built a rig: 4x Sapphire hd5850, among the last to get for a good price. msi 790fx-gd70 - seems fine. AMD 240e. Old hard drive. Cooler Master Silent Pro 1000W (!)

I did not think about four cards not fitting a normal case at all - shock! I was lucky like hell I could squeeze them all in my second old tower  Cool (some drilling is still needed to improve airflow). One of the two cards in the middle runs extremely hot, will have to work something out. still tweaking...

Unfortunately I am not yet fluent in Linux so I went for an old xp license. REMEMBER THE DUMMY PLUGS!

>Ubuntu 11.04 64-bit - Catalyst 11.4, SDK 2.4
why not catalyst 10.12 and sdk 2.1? rumor has it these are better

>Phoenix 1.4 with phatk kernel
gain phatk vs. poclbm?

>Long story short, it worked out just fine and the machines are running fine. But it was nerve-racking worrying about whether the rails >could handle everything. The motherboard was especially worrying, because it supplies up to 75W through the PCI-e ports. 75 * 3 = >225W, or 18.75A. On a 20A rail ...
I really like my cooler master with single rail

>Overclocking: 800/285
>And finally I also experimented with memory underclocking. From stock 1000MHz down to 285MHz.
>Runs stable, and that final tweak seems to be what got me my final numbers. 68C, 66C, and 61C.
what software are you using for tweaking? I have not yet managed to get mine below 600 without crashing... probably I am doing something wrong here

>The on-board GPU worked fine for the first mining rig. [...]
an on-board grafix card is sweet

> ---The first night of running the machines, they were all in my living room with the windows shut. I woke up to an oven, and decided
how could you sleep in there with that three rigs?

>---The last ordeal of my story is something I had completely forgotten to take into account. Circuit breakers. Like most typical homes,
I worry about starting the water cooker or something and the circuit breaker goes off...

feels like it's only worth it if you really like to play and tweak and look after computers. =) ■ bitcointalk top posts
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May 17, 2011, 10:51:42 PM

I'm still playing with building myself, but you certainly make a good point about wire shelves. I'm looking at 'tech benches' at the moment, seems a nice compromise between case and no-case (I don't feel entirely comfortable having a board not securely anchored, but I'm kind of a huge wuss).

P.S. I never said thanks for this article, I built most of my stuff before I read this but it was still a good read nonetheless Smiley

with the horrible "push-clip" securing style
Oh man, I forgot about those. Yeah, they're terrible! I took them off (which was easy).

And yes, you're right about the case connectors. Those wouldn't fit a long video card. If you don't have a case, though, you don't need those connectors, so not a huge deal.

My favorite board thus far is the MSI 890FX-GD70
Yeah, that's a nice board  Cool. It's a shame the last slot is unusable if you have a case.

But, as I said, I probably wouldn't use a case again. I'd just buy a wire shelf from the hardware store, cardboard, and twisty ties. Heck, you could even use extenders and dangle video cards from an upper shelf with the mobo below it Tongue
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"I'm not psychic; I'm just damn good"

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May 23, 2011, 02:14:32 AM

Hi fpgaminer. I hope you don't mind me linking my tread to yours. I'm consolidating build discussions Smiley

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