Puzzling rebooting issue

[The clueless enthusiast]

Hi

 

I have a strange issue with my recently upgreaded build firstly the specs...

 

Ryzen 3600 (with the spire cooler from my 3700x)

Asrock x570 matx

16gb ram

Msi GTX 980ti

Corsair CV650W psu

 

The event viewer simply shows kernal power under critical error- nothing else.

 

The issue is when playing some (i beleieve intensive games) like hitman 2 and watch dogs 2 i get random restarts in the middle of the game at (seemingly random time in eg 10 mins, 20 mins, 32 mins etc(. The strange part is that when playing vr which i have done for hours the pc doesnt behaviour this way. i have updated drivers and bios jsut in case and han it with temps program and the cpu doesnt get above 75c and the gpu 83 so its not a temp issue that i know of.

 

My current theory (that i cant prove either way) is that the psu is outputting too much voltage ripple resulting in instability during higher demand parts of the games.

 

Does anyone have an other better ideas or troubleshootings tips ii could try? id rather not RMA the psu but i will if i have to becasue currettnly some games are just unplayable.

 

Thanks in advance