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Crossfire AMD Radeon 6970, heat issues. - Page 2

post #11 of 25
Thread Starter 
I'm not sure its an airflow issue, because here is my case:



The top fan you see in the front is perfectly aligned to blow right between those GPUs. I can stick my hand inside the case and feel the air flowing in that direction. Those are 120MM fans. The airflow in this case is very good. The spacing is also very good, if the spacing was any farther, I would need a longer crossfire cable. Its enough space to stretch a crossfire cable out with no bends in it at all.

I'm gonna try some AC5 compound, but I'm gonna have to order more.
Edited by chaosblade02 - 10/26/11 at 10:10pm
post #12 of 25
yea it must be the thermal paste or a bad senser
post #13 of 25
i have a 6950 running at 6970 specs and max temp under load is 65. with a twin frozr III cooler of course!

I'd recommend buying an aftermarket solution for the top card.
post #14 of 25
Quote:
Originally Posted by chaosblade02 View Post
I'm not sure its an airflow issue, because here is my case:



The top fan you see in the front is perfectly aligned to blow right between those GPUs. I can stick my hand inside the case and feel the air flowing in that direction. Those are 120MM fans. The airflow in this case is very good. The spacing is also very good, if the spacing was any farther, I would need a longer crossfire cable. Its enough space to stretch a crossfire cable out with no bends in it at all.

I'm gonna try some AC5 compound, but I'm gonna have to order more.
what cfm rating are the fans in the case and how many harddrives do you have infront of the fans?
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post #15 of 25
Thread Starter 
This is really odd, but I did some testing at different fan speeds just to see what kinda temps I get, keeping an eye on it. And after 60% fan speed it doesn't seem to cool any better? Setting auto 60% fan, gets me almost as good as auto 100%? Something is definitely not right here and I would like to get to the bottom of it. Its definitely blowing way more air out at 100% than 60%. Someone explained it could be a bad sensor, suppose it is, how do you solve that problem? My top card still runs 15-18C hotter than the bottom under load. Its not uncommon to see the bottom card running 60C under load and the top card running 75-78C. I basically cannot run my cards at 100% usage, and have to adjust my settings in game to where they don't work as hard. I am really disappointed, I spent a lot of money on these cards, and this PC I can't even max out Witcher 2 without running into serious heat issues.

Forgot to add that I put some AC5 on the GPUs, and it helped a little bit but not much. Definitely not enough to counter the top card getting so much hotter than the bottom. 5-10C more I could deal with, but 15-18C? ***?
Edited by chaosblade02 - 11/6/11 at 8:17am
post #16 of 25
I have you tried switching the gpus? Put the bottom card on top and the top card on bottom. If the card that was on top is still as hot or hotter now that it's on the bottom you can conclude that there is a problem with the card. If the card that was on the bottom is now as hot as the other was because it's on top, then there's a problem with your case/airflow.

Also ambient temperatures in the room have a bigger effect then people think. Someone else may be getting much better temps just because their room is five degrees cooler.

Finally air flow in the case is one thing, but air flow around the case is another. Is it's tucked in a corner or something the air all around the case may be heating up, and thus not being helpful for cooling your gpus. How are the temps on your other components?
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post #17 of 25
I looked up the cards but I can''t tell if these dump air into your case or not.

1. if they dump air into your case (instead of out the back like my msi reference cards) then there is no hope without installing new coolers/watercooling OR running your fans at 80 to 100%

2. If they dump air out the rear like reference cards make sure you run your gpu fans at 55% or so. The one with the multiple monitors will always be hotter, if possible put your monitors on the lower card which will be cooler.

I was contracted to build 15 or so bitcoin mining rigs with up to 5 gpus per system back when bitcoin made money (lol). I found that any card that dumped air into the case had to be 5770s or lower for multi gpu setups with fans running at 100%. And that was with the memory clocks below the gpu core clocks!
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post #18 of 25
Thread Starter 
These cards dump air out the back, I can stick my hand at the back and feel the hot air blowing out. With room temps of 65 F, my top card still reaches 82-85C after about 20-30 minutes of 90-100% usage even with the fan blowing 100%. In the summer time I am going to be forced to turn some settings down to lessen GPU usage. I don't really understand how anyone is going to get substantially better with a reference model, there is nothing wrong with my air flow, and the cooling system is a little bit better than reference.

Max safe temp is 104C according to AMD, I'm sure I can keep the top card below that.

Replacing the thermal compound did next to nothing, maybe a 1-2 C difference.

I got a large box window fan that I stuck right next to the case with the side open, and the top card ran about 75C compared to 80C and that is MASSIVE air flow. I mean unless you got that top card water cooled, I don't see how anyone is going to get 75C stable on the top card in a crossfire setup with these. What I'm getting and what I hear people say they are getting, the difference is night and day.

I contacted AMD, and they tell me what I'm getting is perfectly normal with crossfire. They said my cards are well within the safe design limits.
Edited by chaosblade02 - 11/6/11 at 3:13pm
post #19 of 25
try switching the two cards then you can tell if the top card is bad or if its jsut a case of being in a bad spot\\
post #20 of 25
Thread Starter 
Quote:
Originally Posted by Onions View Post
try switching the two cards then you can tell if the top card is bad or if its jsut a case of being in a bad spot\\
I did that. Even tested both individually, and they perform equally consistent. I actually bought some IC diamond 7, and put on them. Stuff was hard to work with but I got a good even coat on there. Had to drop the stuff in some piping hot water to make it more pliable.

The cards run very cool under load individually. Stress test with Kombuster after 10 minutes, the individual cards, would hit about 72C and sorta balance out. In crossfire, the gap stays around 10C, but after the bottom card balances out, the top card continues to gain heat, and the temp gap between the 2 cards just continues to widen, even at 100% fan speed. I stop the test when the top card hits 90C. The rise in temp was gradually slowing down the hotter the top card got, its possible it would also balance out around a little above 90C, still lower than max safe temp, but these are $350 GPUs and I want them to last.

What kind of water cooling options do I got, suppose I end up having to go that route? I need it to be not much thicker than the stock cooling system. The gap between the cards is the size where a basic crossfire cable will connect both fully stretched out. Would I be able to water cool just the top card and and leave the original cooling on the bottom card? If I can get something for around $100 that will cool substantially better than what I got, I think I might go that route.

Now I replaced the thermal compound on the cards, but left the original pads. Is there anything I can do to improve the cooling where those pads are applied? Does anyone sell better thermal pads?
Edited by chaosblade02 - 11/7/11 at 8:26am
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