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Top card in crossfire a bit warm.

post #1 of 17
Thread Starter 
Hello I recently got another 6950 Direct CU 2 and I've noticed the top card is 25C hotter than the bottom one in games. The bottom one never reaches higher than 60 load but the top one goes anywhere from 85 - 90 under load. I have a bit of space for airflow and I also installed a fan on the side of the case blowing between the cards and that didn't help at all, not even a single degree drop. I know 85 isn't really something to worry about but I'd love for it to be cooler. No I wont go water cooling and no I wont buy new after market coolers.

Any ideas would be great, thanks.
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550D
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post #2 of 17
Looking at the P8P67 Pro, there should be enough space for the airflow for the top card.

A few questions of course. Before you CFed was your first card this hot?
And also, how fast are the fans running at?
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post #3 of 17
Well, I don't know about DCUs, but TFIIIs vent a lot of air out the side, so the top card picks up the bottom's exhaust. If that is your problem, the only thing I can think of is to make a 120MM hole in the side of your case and put a fan there (by the GPUs). It might be possible to get so much airflow from front to back of these cards too, but that would require some pretty heavy duty fans.
    
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post #4 of 17
Is there a full slot of space between the cards? Have you tried taking the cards out and switching positions? If the same card keeps running hot you know it is an issue with that card.
    
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post #5 of 17
Thread Starter 
Quote:
Originally Posted by iJustin;13815167 
Looking at the P8P67 Pro, there should be enough space for the airflow for the top card.

A few questions of course. Before you CFed was your first card this hot?
And also, how fast are the fans running at?

My first card stayed at around 60 as well under load. The fan only seems to ramp up on the top card as it gets hotter than the bottom. The bottom tends to up itself to about 30 - 35% which keeps it at a nice 60C no matter what game i'm putting it through.
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post #6 of 17
heh, welcome to multigpu set ups.
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post #7 of 17
In Crossfire, the top card will always be warmer than the bottom. The heat output of the bottom card will heat up the top card, 10 times out of 10.
    
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post #8 of 17
Thread Starter 
Quote:
Originally Posted by snelan;13815178 
Well, I don't know about DCUs, but TFIIIs vent a lot of air out the side, so the top card picks up the bottom's exhaust. If that is your problem, the only thing I can think of is to make a 120MM hole in the side of your case and put a fan there (by the GPUs). It might be possible to get so much airflow from front to back of these cards too, but that would require some pretty heavy duty fans.

Pretty sure these vent out the back of the case.
550D
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post #9 of 17
My top card is usually 10-15c hotter than the lower. I also keep the top card at 60% fan speed and the bottom is usually at 30%
 
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post #10 of 17
Heat rises. This is to be expected.
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