A shutdown is caused by a safety being tripped. What happens when you run Prime95 or Furmark?
Did you ever figure out a solution to this. I am experiencing the issue when playing PUBG. While playing the match, randomly during the match the entire computer will shut off. Afterwards, pressing the power button will not turn the computer back on. I have to flip the switch on the back of the PSU off and on to get the computer to restart.
I currently have the following test system:
GPU: RX Vega 64
CPU: Ryzen 1800X
Mobo: MSI X370 XPOWER Gaming Titanium (latest bios)
RAM: 16gb 2933mhz
PSU: Seasonic Prime Titanium 1000W
I'm thinking of getting a 1200 or even 1500 watt PSU for RX Vega 64 since this never was happening when using the old R9 Fury. Playing PUBG at 1440p 144Hz freesync I see power consumption over 600 watts from the wall measuring with a Kill-A-Watt from Fry's. Maybe the Seasonic cannot handle the load spikes but I doubt they go over 800 watts so a 1000w should be sufficient.