I've had my PC for over 4 years by now and I've never ran into any issues like this before. Whenever I play any demanding games such as Scum/GTA V/Tekken 7/COD Warzone/Battlefield 4 or even play videos on Chrome, my PC runs into random crashes. There's no BSoD or any type of error message whatsoever. It just goes dead and restarts. Heaven Benchmark on Extreme settings triggers the crash everytime, while other benchmarks like Kombustor/Aida 64 run smoothly. I've checked CPU/GPU temperatures and It doesn't seem to be the problem. I've speculated the GPU could be damaged but I couldn't trigger the crash when testing it on another system. I tried everything I've seen online (reinstalling drivers with DDU/formatting/etc) and nothing helped. I sincerely have no idea on what's causing the crashes.
Motherboard: Gigabyte GA-H170-GAMING 3 DDR3
CPU: i5 6600 3,3 GHz
CPU Cooler: Stock
GPU: MSI GTX 1080 Gaming 8G
RAM: Kingston HyperX Fury 8GB DDR3 1600MHz (Dual Channel)
Storage: Samsung 850 EVO 250GB SSD + Seagate 1TB HDD
PSU: Seasonic S12II 620W
Case: NZXT Noctis 450
Monitor: MG248Q 1080p @144hz
Motherboard: Gigabyte GA-H170-GAMING 3 DDR3
CPU: i5 6600 3,3 GHz
CPU Cooler: Stock
GPU: MSI GTX 1080 Gaming 8G
RAM: Kingston HyperX Fury 8GB DDR3 1600MHz (Dual Channel)
Storage: Samsung 850 EVO 250GB SSD + Seagate 1TB HDD
PSU: Seasonic S12II 620W
Case: NZXT Noctis 450
Monitor: MG248Q 1080p @144hz