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Thread: AMD 7990's Crossfired Heat Issues

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    Default AMD 7990's Crossfired Heat Issues

    I built my friend Kevin a system about 4 months ago. The system included 2-HD 7990's in a crossfire config. He doesn't have at the moment money to install a water cooling system in this build. Ths bottom card at full load runs at 74 degrees C but, the top card runs at 91 degrees C at full load. When the top card hits 91 the system goes into a safe mode and shuts down on him. Anyone else running dual 7990's having this problem? At the moment, without water cooling my solution is for him to buy a bigger case that can provide more air flow. The cpu has a AIO Corair 110 on it. I have switched both the cards and I still end up with roughly the same result of the upper card being hotter. Kinda pissed because I just think it's the design of the cooler that is causing this issue.

    Any thoughts?

  2. #2
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    Default Re: AMD 7990's Crossfired Heat Issues

    With cards in SLI or Crossfire, you always run into issues with heat for the top card if they are air cooled. The problem is the boards are so close together that the only air the top card pulls in with its fan is the hot air off the bottom card, heating up the top card A LOT. If he can move them a slot or so apart you can get better cooling for the top card. Other than that, the only real way to fix it is water cooling.

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    Default Re: AMD 7990's Crossfired Heat Issues

    I already tried to move them with a slot between them but the motherboard has pci-e slots that are setup with 16x,16x,8x. I tried explaining to him that moving to a 8x slot really isn't going to decrease performance that much. That's they way I left the system last time I was over his place. When I went back this morning he had moved it back to the 16x slot. IDK at this point. I'm sticking with telling him to get a better case or start saving for waco parts.

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    Default Re: AMD 7990's Crossfired Heat Issues

    Tell him he can put it in the bottom slot and go from 500FPS to 590FPS or he can leave it in the 16x slot and kill his $1000 card because that's what will happen if its left like this...

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    Default Re: AMD 7990's Crossfired Heat Issues

    Quote Originally Posted by saturn97 View Post
    I already tried to move them with a slot between them but the motherboard has pci-e slots that are setup with 16x,16x,8x. I tried explaining to him that moving to a 8x slot really isn't going to decrease performance that much. That's they way I left the system last time I was over his place. When I went back this morning he had moved it back to the 16x slot. IDK at this point. I'm sticking with telling him to get a better case or start saving for waco parts.
    The case isnt the issue, that extra space wont drop the speed too much, but will allow the card to breathe a bit better. Really the solution is waco. Or he could get one of the XSPC kits with a single gpu block on the top card for now would solve it.

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    Default re: AMD 7990's Crossfired Heat Issues

    From the early days of folding at home using GPU's all I can recommend is helping the airflow of the effected gpu. I did this by adding a box to the rear of the machine with a high cfm fan fitted to it. it is a cheap interim fix until you get water involved. Take a look at this old review to get a clearer idea of what I mean:

    #1019 - Cooler Master ATCS 840 Case Video Review - YouTube

    A simple box with a high cfm fan sucking air through the gpu's. I used with 9800 gx2's that were hot beasts and rather than make any permanent changes to the case I used existing mounts and a little duct tape for the few months until I could watercool
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  7. The following user thanks grumpydaddy For this above post:

    saturn97 (20-10-2013)

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    Default re: AMD 7990's Crossfired Heat Issues

    Thanks Grumpy.

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    Default re: AMD 7990's Crossfired Heat Issues

    A high flow case fan mounted to the side panel, blowing at the top GPU may help.
    What case is this all in?

    MOD Note: I merged the ~two~ posts with the same name/subject into one post.

    RealNeil

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    Default re: AMD 7990's Crossfired Heat Issues

    Quote Originally Posted by realneil View Post
    a high flow case fan mounted to the side panel, blowing at the top gpu may help.
    What case is this all in?

    mod note: i merged the ~two~ posts with the same name/subject into one post.

    Realneil
    lian li pc-a05fnb


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    Default re: AMD 7990's Crossfired Heat Issues

    That's an elegant looking case, but one with a good fan on the side panel blowing outside air in towards the GPU's intake would help.

    Does he have the latest drivers? What brand are the cards?

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    Default re: AMD 7990's Crossfired Heat Issues

    That is what I think. At least for now untill he can waco.Get some air acros those card's or even take one out for now.

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    Default re: AMD 7990's Crossfired Heat Issues

    I talked to him about a half hour ago. I'm going to drill some holes in the side panel and if there is enough room place a fan internally inside the case. If not I will mount it on the outside of the side panel with a fan blowing in. Not the prettiest solution but, better than destroying a $900 card.

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    Default re: AMD 7990's Crossfired Heat Issues

    Talk him into a case with better airflow options.

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    Default re: AMD 7990's Crossfired Heat Issues

    Tell you what you could do, just to prove a point, make one of those rear extractor boxes out of.... cardboard .

    Provided you have a decent high flow fan you can use, cardboard a bit of duct tape the fan and about half an hour later you can observe both the difference in temps and the difference in gpu fan revs.

    You could even shape the "box" like a V with the fan in the open end and the end of the v cut to the size of a single card.

    While we are using cardboard You could "box in" both graphics cards internally and fit a fan to that boxing to force air through the gpu's ...kinda like the asus sabertooth but on steroids

    I still don't think I have you convinced so I am not going to argue and I will not say you are doing it wrong but from experience I will say that unless you can duct any additional fan to force the direction of airflow exactly where you want it, ie through the hot card, I feel you are going to be disappointed with the result.


    Of course the downside of this is that without effort, and maybe even with, such a solution is going to be butt ugly..... The problem there is you are talking to a function over form guy
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    Default re: AMD 7990's Crossfired Heat Issues

    Quote Originally Posted by grumpydaddy View Post
    you are talking to a function over form guy
    LOL!

    Love it! (been there, done that)

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    Default re: AMD 7990's Crossfired Heat Issues

    I'd read elsewhere that a pair of 7990s have that problem. And, yeah, just the obvious options: (1) change case to something with side panel fan mount[s], (2) remove side panel and place a table fan next to it pointing inward, (3) split the cards back to have an extra slot in between like you had it (which might still need #1 or #2), etc. Also read where crossfired cards had no appreciable delta in performance using one or more x8 slots versus all x16 ... so I'd be tempted to put the things back as you had them initially (#3) and go from there; also then run a few gpu benchmarks to prove/disprove the notion.
    Alternate System: i7 3930K @ 4.6GHz, ASUS Rampage IV Formula, 16GB Corsair Vengeance, AMD 6990, Samsung 840 Pro 256GB, Cooler Master HAF XB, Seasonic X-1250, various NoiseBlocker e-Loop fans.

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