hamiltino (OP)
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November 04, 2013, 03:07:02 AM Last edit: November 04, 2013, 01:45:58 PM by hamiltino |
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. No need for any more help,
thanks.
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stacking coin
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verloren
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November 04, 2013, 04:03:33 AM |
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You're going to need a dual PSU system. -> https://hashcat.net/forum/thread-2530.htmlCooling will be an issue inside a standard ATX case (heat venting). Maybe the reliable milk crate + box fan, or run a water cooling system. I think a standard motherboard with 4 PCIe slots and 4 risers would work.
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johncarpe64
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November 04, 2013, 04:32:23 AM |
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Hi guys,
I need advice on what case, motherboard and anything else i need to build a pc with 4 7990's inside. However most importantly what case choices are there to fit such a rig without having a build a custom one.
Really need some advice here. Please don't tell me its not worth it or whatever, the build is not for you.
Regards.
Since you will only be using 4 PCIE slots it should be easy, any motherboard then can support quad crossfire should work.. For casing, there is none that can fit in, you will need a custom case which you can find many topic about it (google it)..
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RandomQ
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November 04, 2013, 06:09:45 AM |
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I couldn't get one 7990 to stay under 95C with no case and a 20" box fan. Good luck with 4.
1. Get the 3 slot version if you can find it 2. I don't think quad crossfire works with dual gnu cards on windows
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verloren
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November 04, 2013, 07:05:31 AM |
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I couldn't get one 7990 to stay under 95C with no case and a 20" box fan. Good luck with 4.
1. Get the 3 slot version if you can find it 2. I don't think quad crossfire works with dual gnu cards on windows
Would it be possible to run with a KeplerDynamics SigmaCool mount + 8x Antec Kuhler 620/920s? Not 100% sure if those conversion mounts will fit the 7990 though.
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RChevalier
Member
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Activity: 94
Merit: 10
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November 04, 2013, 07:47:10 AM |
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Which OS are you going to be using? Linux I hope, you will have a tough time getting Windows to recognize all 8 GPUs.
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cdog
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November 04, 2013, 08:32:45 AM |
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Have you ever tried mining before? Because asking a question about using a case (lol) makes it seem like no.
Before you drop $3k, Id try a much smaller scale system, like a 2x7950.
And yes, motherboard matters... a lot... most motherboards wont fit 4x7990 - and you wouldnt want it to.
The cards would be far too hot so close together, thats why you use PCI-E extenders and NO CASE (lol).
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HellDiverUK
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November 04, 2013, 08:39:10 AM |
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You're NOT going to be able to run even 2 7990 in a case without them melting.
I ran a pair of 7950 in a Define XL R2, with 6 120mm fans going flat out, and the cards still got close to their maximum. The heat was ridiculous.
For 4 7990, you're going to need a decent 4-slot board, powered risers, at least two ~1000W PSU, and an open frame in your garage/shed or basement.
I do question the sanity of it, even if you get the things mining reliably, they're going to be sucking a LOT of power, and not mining very much. You'd be better off with a couple of BlueFury USB miners - about 1/10th the price and do 2.5GH each using about 5W.
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hamiltino (OP)
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November 04, 2013, 08:45:16 AM Last edit: November 04, 2013, 01:46:12 PM by hamiltino |
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stacking coin
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wizby
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Merit: 10
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November 04, 2013, 08:59:00 AM |
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i.ve had rig with 4 7990 in open case. running undervolted from lepa 1600w. it was pulling ~1700-1750w at a wall. sadly didn't took any pictures of that chicken roaster windows works fine with that configuration.
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worldinacoin
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November 04, 2013, 09:03:11 AM |
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Thanks for all the replies,
I have put together a rig using the Lian-li 8000D(The case is big enough for good airflow.), xeon cpu, 2 psu's, asrock 4 pcie mobo, 4 7990's
cost around 5k all up.
That is quite a good bargain!
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JessicaSe
Legendary
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Activity: 840
Merit: 1000
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November 04, 2013, 01:13:04 PM |
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I couldn't get one 7990 to stay under 95C with no case and a 20" box fan. Good luck with 4.
1. Get the 3 slot version if you can find it 2. I don't think quad crossfire works with dual gnu cards on windows
Did you undervolt and overclock? You should be able to stay at the range of 70C....
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