[SOLVED] PC reboots while playing demanding games for a few minutes

Jan 5, 2020
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Over the last few days my PC has begun to shut down and reboot instantly while playing some demanding games for a few minutes. There are no warnings or BSoD and even after i turned off the "restart automatically" option in windows it continues to do the same thing which makes me think it's the PSU.

I did a stress test and monitored temps and they seemed fine, mainly in the 50s for my CPU and 30-40s for my GPU. I reseated all the cables in my PC and removed any obstructions over the mobo. I've had my PC for about 4 years although i replaced the PSU and GPU around Christmas time to the Kolink ATX 1000W and the Sapphire Nitro+ Vega64 respectively. I don't know all too much about PCs so I was wondering if the experts know anything else I could do before I try to see if I can still RMA my PSU.
 
Jan 5, 2020
4
0
10
I would bet that PSU is the problem. It is not a quality PSU.
Do you have any suggestions for what I should get instead? Specs are as follows :

ASUS Z-270P (Planning to upgrade to a AM4 MSI TOMAHAWK B450M)

i5-7400 (Planning to upgrade to a Ryzen 3600X)

Sapphire Nitro+ Vega64

16GB 3200MHz RAM

500GB nvme SSD

120GB SATA SSD

1TB HDD