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Eight Dual-Slot Graphics Cards

post #1 of 58
Thread Starter 
Hi Guys,

So let's say that I wanted to build a single machine with 8 x Radeon 5870 (or 6970, although I think the former will work better) cards in order to maximize my computing resources for a project. Note that, in particular, I am not looking to use this machine for gaming at all. I know the max for Cross Fire is 4 GPUs, but I believe that Linux can run up to 8 independent GPUs for strictly non-gaming purposes. My question is, how can I fit all of these into the same machine?

First, please see the following motherboard: http://www.newegg.com/Product/Produc...82E16813130595

As you can see, this board has a total of 8 x PCI Express slots. I do realize that not all of the slots are full bandwidth, but it turns out that my project is not bandwidth intensive at all, so that will not be a problem. I just need a crap ton of GPU power. The main problem is, how would I fit 8 x dual slot cards into this motherboard? I have heard that there are some kind of adapters that might allow dual slot cards in adjacent slots. Where can I find something like that?

(Actually, I may not even need 8 x full-length slots, since bandwidth doesn't matter. I could just look at motherboards with 8 x PCI Express slots of any size, and then just use adapters to plug in the cards. Either way, though, one of the main problems will be finding some way to "mount" all of these cards in some kind of chassis.)

Also, I am certainly aware that 8 x 5870s will require a boat load of power. My current rough estimate is that I would need about 2200W to power the whole setup (according to AMD's site, a single card requires about 600W for the whole system, and the maximum board power for each card is 228W, so that gives 600 + 7*228 = 2,196W). Since I don't think such a monstrous power supply exists, I was planning on getting 2 x 1200W power supplies. I have never run with more than one power supply before either, so eventually I will also need some guidance on how to install the second power supply.

In any case... do you guys think running 8 cards like this is possible? Given that I have the money and resources to do so. The machine will be set up in a very well-air conditioned building, and of course I will try to get a case and/or open air set up that will maximize air flow to the cards. Let me know what you guys think.

Thanks in advance!
Muhahahaha



PS: What do you think about getting 2 of these for the power? They have the right number of PCI Express plugs and everything. http://www.newegg.com/Product/Produc...82E16817371032
Edited by Muhahahaha - 5/8/11 at 9:57pm
    
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post #2 of 58
PCIe Extenders or PCIe Risers are what you need.

I know they exist, unfortunately I have no idea where one can get them.

As for dual power supplies, a quick mod that links the Power On signal cables on both units should be sufficient for using both at the same time. Look for a tutorial though; I've never done it and I'm not sure.
Edited by AblueXKRS - 5/8/11 at 9:49pm
post #3 of 58
Yes it is possible but you may need to go watercooling or try to find a single slot 5870. The only other option is a flexible adapter that extends the PCI-E slot along a ribbon like cable about 6 inches which could also work. For the powersupplies there is actually an adapter that hooks up both of the 24 pins into one so that both powersupplies work at the same time without ahving to use a paper clip or anything like that.
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post #4 of 58
What would you use said GPU power for?

Folding?
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post #5 of 58
Quote:
Originally Posted by AdmiralThrawn View Post
PCIe Extenders or PCIe Risers are what you need.

I know they exist, unfortunately I have no idea where one can get them.

As for dual power supplies, a quick mod that links the Power On signal cables on both units should be sufficient for using both at the same time. Look for a tutorial though; I've never done it and I'm not sure.
This,

Take a look at this thread, it's pretty much what your doing except your config is far more powerful.

http://www.overclock.net/overclock-n...g-machine.html

And here's rough guide of how to jump start the second PSU for your build,
http://www.overclock.net/faqs/96712-...upply-psu.html
post #6 of 58
There are some ebay stores that carry PCI-E risers, such as this. Never bought them though so I cannot comment on the store. You'll need around 1900W for the GPUs so you might need (I'm not sure) special circuit put into your home.
 
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post #7 of 58
post #8 of 58
I remembered this from a few years ago. It's what you'll want to do with your setup:

post #9 of 58
I would use a variety of 5830's, 5850's and 5870's if I were you. It would save you some power consumption and you could put the 5830's in the x1 slots. Also, maybe you could get your hands on one of these single slot 5830's http://www.bit-tech.net/news/hardwar...slot-radeons/1
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post #10 of 58
there is something called a PSU joiner or something its used in the Temple build log of 6-bolt here

edit: http://www.overclock.net/sponsored-c...l#post12785041 here the post is and here is the picture http://www.6bolt.com/temple/worklog/...1/IMG_0444.JPG
Edited by labbu63 - 5/8/11 at 10:05pm
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