2x EVGA GTX 980 watercooled heating problem after mining bitcoin

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dr_serious

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Jan 31, 2009
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A few weeks ago I bought a second GTX 980. Both work perfectly never had an issue with them. I never overclocked them very high. I use the EVGA precision x tool to overclock these cards.

2 weeks ago these cards had an idle temp of 25°C and stressed about 35°C.
After being on vacation for 2 weeks I left my PC mining some Bitcoin (Ether). When I came back I saw my pc had a bluescreen and rebooted. Now when I start a game (ARK) I see my first GPU temp going up to 95°C. The new card never goes over 40°C I already set the overclock settings to default. Still the same issue.

When idle the temp goes back to 33°C. But the new card is 27°C.

The GPU with the high temp still works and I can boot with this card alone.
Is this card broken? How can I solve this temperature issue

Note: water cooling loop setup: res - new gpu - old gpu - cpu - rad - rad -res
 
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Sergeant_Sneaky

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I would guess that your pump is too weak, the second card will be getting the heated water from the first card. If the idle temps are normal I would guess that the pump isn't strong enough for the loop when it's producing a lot of heat, what pump do you have?
 
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dr_serious

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I have a EK Water Blocks EK-D5 PWM Pump. I cleaned the whole system. It looked like there was an air bubble in the highest graphic card (oldest).
What is very weird because I have no idea how the water would have changed with the air?

Currently I have turned off all the fans and the GPU's seem to stay under 50 degrees.
 
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Sergeant_Sneaky

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That could very well be the issue, as it says in the picture, your water may not be going through the second card, but if it's not, then why was it fine 2 weeks ago, are you sure both cards were running at nice temps? Your CPU is on the same loop after the second GPU? How are the temps on that? If they are fine then I'd say the water wasn't going through the second card. If the CPU is getting hot, then I'd say the pump isn't strong enough.
 
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dr_serious

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CPU is also hot. (close to) idle 44 degrees. Stressed never over 70 degrees.
Everything is in the same loop.

I did some temp checks when I added the second GPU with stress tests. CPU and GPU temps where fine. I don't know the exact numbers but I think both GPU's where under 40 degrees. CPU was always to the hot side...

Maybe the pump lost some power? My PC is always running, the pump is 5 months old.
 
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Sergeant_Sneaky

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What CPU do you have? The load temp would be normal if you had an oc'd 8 core i7. If the pump wasn't strong enough I'd guess that the CPU would be a fair bit hotter too. If your bridge is the wrong way round, I'd suggest switching that around, so at least you will know if that is the issue for the 95c second GPU.
 
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dr_serious

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It seems like there was a lot of air in the upper GPU. These are the temps now:
CPU idle 36 degrees stressed 55 degrees. GPU 27 idle 51 stressed.

I still didn't change the loop direction. Will change this next maintenance or when the temp goes higher again.



Full spec:

CPU Motherboard Graphics RAM
i7 3770K Asrock Z77 Extreme 2x 980 GTX 16 GB
Hard Drive Cooling OS
Samsung SSD 840 Series Pro 256GB EK Watercooling Windows 7
Power
Corsair RM850
 
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