Okay everyone here's the latest. PROBLEM FIXED. I've been able to play all games, including the ones that caused crashing within 15 minutes. Whole PSU is running smooth. Thanks everyone. Peace out!

I don't know exactly what fixed it but here are the changed I made.

Upgraded psu to Corsair HX1000 watt (plat rated)

Updated mobo bios

Removed lianli strimer cables

Deactivated discord gpu hardware acceleration.