I have not made any changes, at this point, to my standard overclock on a new system. When I run the initial benchmark in the extreme tuning utility my pc shuts down immediately. No delay, I press the button and it shuts down.
I've run a short (1 min) stress test in the utility, to see if I got an immediate shutdown, but the stress test worked fine.
Motherboard: Asus ROG Strix Z390-E
CPU: Intel Core I9-9900K @3.6GHz
Core Volage: 1.375
Cooler: Corsair H150i Pro
The only change I've made at all since initial setup is to set the bios overclocking to AI Optimized