Question Pc randomly locks up when gaming

Jan 6, 2021
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-Problem:
Pc locks up completely at random forcing me to reboot by holding the power button.

-When:
During gaming, doesnt matter what as long as its not some ancient game.

-Specs:
Operating System: Windows 10 Pro 64-bit (10.0, Build 19042) (19041.vb_release.191206-1406)
Motherboard: Gigabyte Z97P-D3
BIOS: BIOS Date: 09/18/15 16:34:18 Ver: 04.06.05 (type: BIOS)
Processor: Intel(R) Core(TM) i5-4670K CPU @ 3.40GHz ( Scythe Mugen V2 cooler and Noctua NT-H1 Paste)
Memory: Crucial Ballistics 16GB DDR3-1600MHz
GPU: iChill NVIDIA GeForce GTX 1080 Ti X3 11GB (Noctua NT-H1 Paste)
Driver: 466.47 (install using DDU guide as usual)
Current Mode: 3440 x 1440 (32 bit) (75Hz) thru Displayport cable
Monitor: iiyama PL3493WQ
PSU: Seasonic Focus-GX 750W
OS SSD: Samsung SSD 850 PRO 256GB (96% on crystaldisk info)
Steam and games on SSD: SanDisk Ultra II 960GB (79% on crystaldisk info)

-Temps:
Gpu runs at the full +-1950Mhz and hits 85c at max
Cpu i have never seen above 50c, the mugen is an amazing cooler
Case temps and other sensors on the motherboard never go above 45c (HWinfo64)
I have 140mm noctua industrial fans. 2 intake 1 outtake.

-Other:
I used to run a slight overclock in the cpu but removed it and have the same problems, now running default bios settings.
Windows and all other drivers are up-to-date, cant find anything newer, also rolled back the gpu drivers several times but did not change performance.
Had this problem for months now, reinstalling windows did not help, i also rebuilt and cleaned the entire pc. The gpu is using 2 seperate power cables as requested by the manual of the psu.

Out of options so asking for help, something is not right but i cant find anything out of order.
 

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