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Author Topic: My First Open Air Rig - 4x 6970 1x 6950 - 2gh/s - "The Mine Cart"  (Read 2281 times)
CrazyGuy
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September 09, 2011, 06:51:31 AM
 #1

"The Mine Cart"

I would like to share my first open air rig with you guys. Built inside of a storage crate, all cards are running cool at 2 gh/s total. 6970s clocked at 920/795 and 6950 at 820/700. All 100% fan speed with a little help from a rear box fan.

Specs:
  • Case: Storage crate!
  • Motherboard: Gigabyte AM3+ UD3
  • CPU: AMD Athlon II Dual core 2.8 ghz
  • Memory: 2gb DDR3 memory
  • PSU: 1200 Watt Corsair ATX
  • OS: Linuxcoin running off of 4gb usb stick
  • GPU: 4x 6970 (920/795 clocks)     1x 6950 (820/700 clocks)

I was hoping to get the lonely 6950 out left in but my power supply couldn't handle the draw. I may try playing around with the card bios this weekend to get past the 125mhz mem underclock limits of the 6900 series cards and bring my power usage down.




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chungenhung
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September 09, 2011, 06:05:12 PM
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can you upload pictures of other views? I want to see how you are holding those cards up.

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stryker
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September 09, 2011, 07:10:13 PM
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can you upload pictures of other views? I want to see how you are holding those cards up.

By the process of "jamming em in" I think  Grin

It is rather a "novel" design though.... very fitting with the homer avatar
CrazyGuy
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September 11, 2011, 04:27:20 PM
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Haha, I'll upload some more pics tonight. Couple of rods going across the crate holding the cards up.

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deslok
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September 11, 2011, 04:28:18 PM
 #5

i love the idea but i'm affriad you're going to melt the milkcrate!

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catfish
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September 11, 2011, 07:32:55 PM
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i love the idea but i'm affriad you're going to melt the milkcrate!

How much distance between the PCI-e connectors on the GPUs
and the corresponding slots on the mobos ? It looks like more
than a regular PCI-e extender is allowed to go to.

Two out of my four rigs ended up having one GPU (usually the left-most card, sitting to the left of the CPU) that couldn't reach the closest PCIe slot.

I simply daisy-chain the extenders. In both cases, I've used an x1->x1 extender connected to the logic board, then the x1->x16 extender into the GPU.

Whether this would work for the *really* high current draw GPUs is a matter of experimentation (with a fire extinguisher handy... Cheesy ) - but I've had an overclocked no-name 5830 (with big protruding heatpipes - the ones that look good but don't cool well) connected this way for weeks at full output. I don't have wattage figures for the individual cards, but this particular card runs 300-303 megahash/sec.

It must be drawing *some* power through the PCIe slot as well as the two 6-pin PCIe power cables - and it appears that the x1 daisychain is up to the job. I've inspected the cable today because of some unrelated failures in other cards, and there's nothing that'd indicate obvious overheating in the extender.

I probably wouldn't stick a valued high-end card on the end of a daisychain though... and I wouldn't try daisychaining three extenders. BTW, none of my daisychains used the Molex-augmented extenders... just plain dual-layer ribbon cable.


As always, YMMV, I'm not a qualified Mining Hardware Engineer Professional etc.

...so I give in to the rhythm, the click click clack
I'm too wasted to fight back...


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worldinacoin
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September 13, 2011, 09:17:39 AM
 #7

The max I dare to put in an rig is only 3 GPU which I find it very hot.  How do you keep that thing cool within limits?
CrazyGuy
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September 17, 2011, 02:13:25 AM
 #8

The max I dare to put in an rig is only 3 GPU which I find it very hot.  How do you keep that thing cool within limits?
I think the box fan is helping a bit. All cards are memory underclocked as low as they go without a bios flash.
New Specs:
1x 6950
3x 6970
1x 5970



I should be able to pull a bit more out of the 5970 but I'm going to let it burn in at stock core clock for a couple days.

Here's the video I promised to post.
http://youtu.be/fqqcdfEYN6Q

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worldinacoin
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September 17, 2011, 12:35:16 PM
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Kinda low yes, but there is some real mechanical engineering ingenuity Smiley
CrazyGuy
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September 17, 2011, 04:50:55 PM
 #10


I should be able to pull a bit more out of the 5970 but I'm going to let it burn in at stock core clock for a couple days.



You rates are quite low.
You should be able to pull ~336 MH/s at stock cloks and
~ 371 MH/s @800/300 for each core on the 5970.

Yeh, both cores are under 60 degrees so I figured I could push it a bit more. Problem is, I'm hovering right under max draw on my PSU. I have the minecart switched off at the moment and I'm selling a few of the cards in the marketplace threads.

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