I need help ASAP pls

Modey2222

Distinguished
May 19, 2014
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18,510
Hello guys
i have a weird problem my PC shuts down under heavy load (Gaming) but there's no overheating issues with me .i stressed my CPU and its fine but my GPU Stress test doesn't complete it shuts down the PC i read alot of issues like this with others but there is no straight answer i know the problem lies in one of these (Power Supply - GPU - Motherboard) so if there is anything that can help me determine which part is the problem please share it.

Thanks in advance.

Specs
Cpu: INTEL core i7 4770K
Motherboard: Gigabyte G.1 Sniper 5
GPU: Nvidia GTX 780
PSU: Corsair cx750
SSd Adata xpg 910


UPDATE 22/11: My PC ran longer than it used to today but i tried valley benchmark again and i monitored it with MSI Afterburner the benchmark draw 100% power of the GPU and it was fine but somewhere in the benchmark it draw 84% power then it happened again now i'm confused is it the GPU or PSU and there wasn't any overheating max 75 degree please guys any help.
 

Modey2222

Distinguished
May 19, 2014
10
0
18,510

i edited my post sorry i forgot to write my specs