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AXPs in SLI on 2x GTX 480 Heat Issue

post #1 of 41
Thread Starter 
I recently installed 2 Accelero Xtreme Pluses on my two GTX 480s. My setup is very similar to hodgoes2001's in that we have cases near the same and both of our cards are on our motherboards the same...this means the two cards take up 6 slots in a row and are sandwiched together. I'm sure most of you know about hodgoes2001's AXP setup...here it is for those who don't...mine is identical when it comes to the GPUs and soundcard:

http://www.overclock.net/nvidia-cooling/913587-56k-warning-how-install-evga-backplate.html

The issue I'm having is that my top card and bottom card have huge temp differences. When they are alone, they both individually max out at 67C on Furmark, thus proving the seating is fine and the chips are identical in temperature. When they're together, the top card shoots up to 100C on Furmark and the bottom stays at 72C (probably because of less space with 2 cards and a hotter case from the 100C card above).

The only reasoning I have for this is the fact that the top card has barely any air below it to move. The problem with this reasoning is, if you look at hodgoes2001's setup, his top card maxes at 69C and his bottom at 65C (not sure what program he used, but the emphasis is on the difference in temps). His side panel has 2x 140mm fans and I have 1x 200mm fan. I've spoke to him about this and we both have NO logical reasoning at all for this. Identical setups yet my top card bakes. We also concluded my ambient temp is lower than his =/

Anyone have any reasoning behind this or suggestions?
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post #2 of 41
we maybe I have one...
your 200mm fan maybe isn't directing air to the first card as it needs...as you now most of air from fan come from end of the blades and if 200mm fan isn't in line with your fop GPU maybe there is the problem.

hodgoes 2x140mm fan are maybe directing air directly to the top card..

if you can try to mount 2x120mm fan if you will notice some difference
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post #3 of 41
The 200s move air over a large area at a slow RPM. You need more cfm between the cards. Replace your 200mm with 120s or get a mobo with an extra slot in between the cards. I have a space in between AXPs and still needed a 120 with fan duct to clear out that hot air. Before the fan duct I was seeing 15-20° temp differentials.
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post #4 of 41
Get better fans for the side intakes, some TY-140s would do you pretty well. They are also relatively cheap.

http://www.svc.com/tr-ty-140.html
Edited by nagle3092 - 6/17/11 at 1:16pm
 
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post #5 of 41
Thread Starter 
Draygonn, I was actually thinking about adding a fan to blow air between the cards towards the back of the case. How important was that fan duct for you? Your case is much longer than mine, my case has room for probably just one fan to blow air in that direction. Check the pic to see what I mean.

I was going to use a Gentle Typhoon AP15 120mm, as I have two of those for my H70 and they run like champs, but those TY-140s look pretty tempting.
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post #6 of 41
I see where hodgoes2001 hit 91°c on his card, then it dropped.

Are you maxing the fan speed?
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post #7 of 41
Thread Starter 
Yes. Can't even hear the difference between the lowest and 100% speed, so I just leave it at 100%.
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post #8 of 41
Quote:
Originally Posted by ChicAgoHawk;13910049 
Yes. Can't even hear the difference between the lowest and 100% speed, so I just leave it at 100%.

Did you ask him how went from 91 to 65 on his card?

How are you controlling the fans, what are the powered from?
And was he loading his cards?
What are your game temps like?
Edited by grunion - 6/17/11 at 2:20pm
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post #9 of 41
Thread Starter 
I did not. I just asked him now and I also gave him the thread in case he wants to chime in. I'm assuming you're talking about my AXP fans...they are plugged into the PCB and are being controlled by MSI Afterburner. The top card has maxed at 1950RPM and the bottom at 1920RPM per HWMonitor.

hodgoes2001 stated those were his load temps...I don't know what program he used.

One of the games I play that stresses my cards pretty well is APB. My cards have gotten up to 75C and 55C top and bottom respectively in that game. 20C difference right there.
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post #10 of 41
Quote:
Originally Posted by ChicAgoHawk;13909919 
Draygonn, I was actually thinking about adding a fan to blow air between the cards towards the back of the case. How important was that fan duct for you? Your case is much longer than mine, my case has room for probably just one fan to blow air in that direction. Check the pic to see what I mean.

My case does not have a sidefan so that 120 was necessary. Because my case is sooooo long I had to add the shroud to direct the air in between the cards. You should definitely add a 120 to your HD cage. I think that will make a big difference, hopefully all you will need.

I was actually surprised to hear the 200mm alone wasn't up to the task. But moving hot air away from sandwiched AXPs is a tough job. Well worth it though.
Edited by Draygonn - 6/17/11 at 3:09pm
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