NowWhat123
I got the RMA TX-750. No longer shutting down in Apex or EFT with power slider at 100% on a 3090 FTW3. AC input power at 600W in-game.
Got a similar one. Pushed Firestrike for a pair of hours in loop. No crash.
Max power spike recorded by my UPS was 720Watts.
Anyway, I have my 3080 undervolted now.