PC shuts down during games and synthetic tests.

[cassiopei1337]

Hi there. Since mid-september I'm having the following issue - my PC shuts down (with no reload) in games and, what I managed to understand, in benchmarks (like Heaven). Interesing thing about this is that it shuts down not in every game, but in high-end ones (like GTA V and PUBG, Forntine), though it didnt shut down in the latest SW Battlefront 2 Beta and, f.e. League of Legends. So, its pretty hard to understand the real reason of this.

My rig is:
GTX 770 Twin Frozr OC 2 GB
i5 - 4460
MB is ASUS H97M-E
8 GB of RAM in Single channel
1TB WD Black HDD
PSU is AeroCool VP-550

What I already did:
Stress-tested the CPU with CPU-Z for 5 mins - no results
Stress-tested the GPU with FurMark for 10 mins - no results, max temp is 85
Tried to run the Heaven benchmark - PC shuts down in a FEW (!) seconds
In GTA V it shuts down in a ~30 mins or so.
In Fortnite and PUBG PC shuts down immediately after landing.

One more thing is that idle temps are very high for no reason - CPU is 55, GPU is 58, though I dont that the problem is connected with temps - I stress-tested both of them which gave no results.
Hope you guys can help me.

 

[MrN1ce9uy]

What do you mean by "no results." I've yet to see you mention your CPU temps under load.

 

[cassiopei1337]

What do you mean by "no results." I've yet to see you mention your CPU temps under load.

Yeah, sorry, by saying no results I meant to say that there was no shut downs. CPU temp under load is something around 63-66, not even hitting 70 mark. That's what I saw while playing BF1. Other games are pretty simular to BF1's result.
GPU temp under heavy load is pretty much the same, as FurMark, maybe a few degrees lower.