GPU Related Pc crashes

[MrAcho]

So about 6 months ago I bought a second hand Zotac RTX 3070 GPU.

Recently both monitors started going black and pc restarts while under heavy load.

Today I changed the thermal paste while I did see a massive improvement of 44% higher score on the SuperPosition Benchmark. After about 20 mins under high usage gaming screens went black again and pc restarted.

There are no good indicators before a crash like screen tears, drops/spikes in gpu clocks or gpu temps.

 

 

 

I am using the latest Nvidia drivers.
Pretty sure the PSU is enough.
Reinstalled windows


Build
Ryzen 5 5500
Zotac RTX 3070
Thermaltake Litepower 650
2x8gb Corsair Vengence 
Asus B550 Motherboard