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How much cooling and power would I need for Quad 7990 (8 x 7970) - Page 2

post #11 of 40
Somebody has already done just this. Have to remember where its posted... hmm, its in the ati forums iirc. Anyways yer gonna need a lot of rads.


Found it.

http://www.overclock.net/t/1307228/powercolor-7990-devil-13-on-newegg-for-999-99/40_40#post_18371936
Edited by tsm106 - 3/13/13 at 7:26pm
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post #12 of 40
Quote:
Originally Posted by TinDaDragon View Post

I didn't know you can have 4 dual gpus cards in the same machine. Wow, impressive!

Commenting to see where this is going

I've only seen it once with 4x6990's, the power requirements and need for a motherboard that can support it make it a difficult task (not to mention cooling).

Quote:
Originally Posted by Snowmen View Post

The Ares cools the main components (basically the GPUs) with a thick 120 mm radiator for two GPUs so with two triples or quads of any thickness, I'm sure that you'll be fine. Of course though, you would need excellent flow through that loop. I also recommend that you run two loops for two reasons:

1) Easier to get more flow
2) In most cases, the loop's order doesn't matter but here, the water reaching the 8th GPU will probably be significantly hotter than after entering the first block which might cause some fairly large differences in GPU temperatures.

I somewhat disagree. Flow is going to be very important, but splitting it to two loops would be a lot of extra work. A pair of good pumps will have no problem delivering the flow needed, generally 1gpm is a nice target. As far as the water heating up, you might see a couple *C variation from GPU 1 to 8 in water temps but it won't be anything extreme. You would have to have barely a trickle of water moving to have it heat up that fast.
post #13 of 40
Good luck finding a mobo with enough PCI-e bandwidth for that? If he wants to crunch numbers on a serious level then Quadro or FirePro. is for him.
post #14 of 40
Thread Starter 
Quote:
Originally Posted by Scorpion49 View Post

He is asking about 8 separate GPU's for some kind of number crunching which means they will be running individually. People do this a lot for things like BOINC, F@H, Bitcoin mining, etc.

Exactly.
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post #15 of 40
Whatever cards you get make sure it fits the 7990 block ek made.
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post #16 of 40
Quote:
Originally Posted by dr/owned View Post

Good luck finding a mobo with enough PCI-e bandwidth for that? If he wants to crunch numbers on a serious level then Quadro or FirePro. is for him.

I don't know what kind of projects it will be doing, but a lot of them don't have very much CPU overhead so bandwidth isn't a huge issue. I folded successfully on a PCI-E 2.0 x1 slot with only a tiny hit to performance.
post #17 of 40
Thread Starter 
Quote:
Originally Posted by Snowmen View Post

In most cases, the loop's order doesn't matter but here, the water reaching the 8th GPU will probably be significantly hotter than after entering the first block which might cause some fairly large differences in GPU temperatures.D

Gonna put the cards in serial so all the cards can access cool water at the same time.
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post #18 of 40
Would Tesla or Phi be an option? Don't you kinda need to know exactly what he's going to be doing in order to optimize the hardware for it?
post #19 of 40
Quote:
Originally Posted by Cyclops View Post

Gonna put the cards in serial so all the cards can access cool water at the same time.

I think you mean parallel since serial is one card after the other wink.gif. If you do this, make sure you have a TON of flow since parallel with two cards already requires a lot of flow.
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post #20 of 40
Thread Starter 
Quote:
Originally Posted by dr/owned View Post

Good luck finding a mobo with enough PCI-e bandwidth for that? If he wants to crunch numbers on a serious level then Quadro or FirePro. is for him.

Nah, I'm not even worried about that. Any X79 board can handle it no problem. I won't even need a Hex Core CPU to get all of them working at 100%
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