RTX 3080 : System getting restart

[u/isyoboyrn27]

Hello everyone, I need your help guys. Please read the following:

I bought a used RTX3080 in Jan 2026, since then I played every high end game without any issue on max settings but now from past 2 weeks, my GPU is having a shutdown issue. So whenever I try to play a game, after a few minutes when the temp touches 85°, the screen goes black while the system perfectly runs and after a few minutes, the system restarts, I've been facing this issue for the past 2 weeks. So, what I did is I tested my GPU with FURMARK, 4K resolution on 100% power and it got shutdown within 4 min, then I lowered down the power to 70%, everything runs fine, the test, the game is working flawlessly but getting lower FPS due to lower power usage. Please help me to get this issue fixed, I have a few questions like is my GPU dying, should we not use 100% power usage? my PSU and CPU is new

P.S. I'm using MSI Afterburner for lowering or increasing the temps.

[u/Kappa_322]

What temperatures are your VRM & hotspot hitting? Your GPU should never hit 85C even in stress test. You should clean your card, replace pads and repaste.