GPU Suddenly Reporting Higher Temps (but not running hotter, I think?)

deckeresq

Prominent
Jul 30, 2017
6
0
510
Hi all,

I have a water cooled GTX 980 (yes, I'm aware I don't need to water cool it, but the waterblock was given as a gift). Normally, it sits around 24C idle.

I woke up a couple days ago, and suddenly RealTemp was showing 60C idle (despite things working as normal the night before). I loaded up a game, only to have temps hit over 90C.

I figured, "Hey, maybe the cooler came loose." I tried tightening the screws on the cooler. No change. I uninstalled and reinstalled it. No change.

Finally, I opened MSI Afterburner to see what that would show. Immediately, my temps dropped back to normal (i.e. 24C idle).

This problem has persisted every day, and opening Afterburner has previously solved this problem.

However, opening Afterburner no longer solves the problem, and as such, I'm unable to load up anything -- the GPU believes it's hitting >95C at points, and will shut off automatically.

What could be the cause of this? How could I fix this?
 

deckeresq

Prominent
Jul 30, 2017
6
0
510
I'm pretty sure the pump is working properly, as once the temperatures drop, they don't ever come back up (until I restart my computer).

It appears that this might be a timing issue of some kind -- if I turn my computer on and simply leave it alone for a bit, the temperatures go back to normal. I'm wondering if this could be caused by GPU sag or something? Perhaps there's a gap between the cooler and the GPU, but as everything heats up, the gap lessens? Is this a thing?
 

deckeresq

Prominent
Jul 30, 2017
6
0
510
I did clean my PC, but it was a few weeks ago. I changed the thermal paste when I uninstalled and reinstalled the cooler (day 2 of problem).

The pump is getting power from a motherboard header.
 

deckeresq

Prominent
Jul 30, 2017
6
0
510


You, sir, are a god among men.

I have no idea how I didn't think to check this, but that's exactly what the problem was! I had all system fans set to minimum power, but to scale up as needed for case temps. This explains my timing issue that I noted previously: as the case got hotter, the header would get more power, and thus my GPU would cool down as time went on. I simply set that one fan header to 100% at all times, and voila, everything is fixed.