Hello PC Peeps!

I built my PC some 2.5 years ago and it's been running fine ever since. Recently, I'm having a problem with it crashing suddenly whenever the GPU is under load - be it gaming or stress testing with Furmark or 3DMark. The system then tries to reboot but gets stuck at the VGA POST stage. I can boot only after completely turning the power off and on again. Even then, sometimes I'm greeted with errors like missing OpenGL support and incompatible GPU driver found. I had to disable and enable the display adapter from device manager to resolve this issue.

My GPU temps are fairly good as I ramped up the fan curve to 100% to test everything. I also tried a fresh windows install with the latest drivers but found no success. Also, in some rare scenarios, the GPU crashes even under little to no load like web surfing.

My initial suspects were GPU, PSU and motherboard. To narrow it down I tried installing the GPU in the 2nd slot to rule out the motherboard PCIe connector but nothing changed. I also tried stressing the CPU under full load for quite some time to check whether PSU can supply enough power consistently and the system remained stable the whole time. I swapped out the PCIe power cables too. All this points in the direction of a GPU failure but I don't have a spare GPU or power supply lying around to swap and confirm the root cause.

Am I missing something here? I would love to hear your thoughts about this.

Specs:

* CPU - 5900X
* GPU - RX 6500XT
* PSU - Corsair RM750 80+ gold certified

PS: I know that it's a weird CPU GPU combo but I had my reasons back then.

Another PS: I planning to upgrade my GPU even if I get a replacement through RMA. I would like your suggestions on 9070XT or RTX 5070 or any other GPUs for 1440P gaming.

Is my GPU dead?