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One GPU getting extremely hot

Paladone

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I recently moved all of my stuff into a new case, but all of a sudden one of my GPU's is getting very hot. Both of my 1080's idle at around 25-30, but as soon as I run, say furmark, the second GPU spikes up to around 70 degrees and then gradually 90-95+. Meanwhile, the first sits at around 60 even after a few minutes at full load. Both are part of the same closed loop, and there appears to be very good flow with little/no visible air in the system. I thought maybe the sensors were just off, but it physically feels twice the temperature.

Anyone know what's going on?
 
Toothless

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Quit using furmark. Problem solved.
 
eidairaman1

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Upper card will always be hotter, heat rises. Purge the loop, if necessary reapply your thermal compounds, reseat heatsinks.
 
Toothless

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hamlop said:
It however occurs even in unigine heaven etc
Click to expand...
It's gonna happen because of how hot air works. It's one reason why I got out of running SLI; top card was 10c hotter.

Doesn't change the fact running furmark is stupid in the first place.
 
Aquinus

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eidairaman1 said:
Upper card will always be hotter, heat rises. Purge the loop, if necessary reapply your thermal compounds, reseat heatsinks.
Click to expand...
Toothless said:
It's gonna happen because of how hot air works. It's one reason why I got out of running SLI; top card was 10c hotter.
Click to expand...
Yet when I ran two 6870s it was always the lower card that got warmer, not the top. Maybe it has everything to do with airflow and thermal contact and nothing to do with which one is on top. ;)
 
Frenzic

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Hi. My top 780 Ti (Both WindForce OC) is on average 13 degrees hotter than my bottom card in SLI. I managed to shave 10 degrees off by running 2 120 Fans at the side to suck out all that hot air that circulate. :)
 
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Something's very wrong there. The way they're at different temps I suspect you're running the gpu blocks in parallel right? We could do with more info on the loop, rad size, which waterblocks, pics perhaps.
Seems like you have a nasty restriction (gunk) in the 2nd card and all the coolant is flowing through the 1st. Even so, with watercooling neither card should be getting much over 50c.

In your shoes I'd be draining the loop, clean all blocks and give the rads a good shake with hot water, test the pump, then re-assemble it all with fresh coolant. It's not a 5 min job unfortunately :/

edit- try re-mounting the block first.
 
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