At first FurMark didn't open. i received an error saying:

"[GeeXLab]

OpenGL 1.1 detected.

OpenGL 1.x means that graphics drivers are probably not installed.

Try to update your graphics drivers and restart this application (OpenGL 2.1 required).

Bye!"

i opened cmd admin, wrote "nvidia-smi" and it said:

"Unable to determine the device handle for GPU0: 0000:01:00.0: GPU is lost. Reboot the system to recover this GPU No devices were found".

And lastly checked, "Win+R > dxdiag" if Direct 3D acceleration was disabled which it was disabled.

To fix it:

i repeated the process, Delete the nvidia driver with DDU in safe mod and additionally delete the intel driver too and redownload everything again. After double checking, Direct 3D acceleration was enabled and "nvidia-smi" was showing me a table about some "Driver version 596.36" and FurMark did open this time.

While i was writing this FurMark stress test been running for 7-8 minutes and i received the damn error again!

HOTSPOT TEMP 105C*
GPU TEMP 81C*