Symptoms:
My brand-new system will intermittently freeze for approximately 1-2 minutes, crash to black screen and immediately reboot (similar to an AC power fail). This happens occasionally under load in different games (Rust, Path of Exile, CounterStrike 2, and others), while web browsing, or while completely idle. Sometimes crashes are 5 minutes apart from eachother, sometimes days apart.
Troubleshooting steps taken so far:
Memtest86 was run for ~ 10 hours, multiple passes, no fails.
FurMark tests, both CPU and GPU-intensive tests, do not seem to accelerate the instance of crashes.
Reinstalled windows 11: No effect
Disabled Global C-States, PBO, adjusted curves, disabled iGPU, removed 3d-vCache and PPU Provisioning drivers based on online forum troubleshooting steps: No effect (reinstalled/reverted settings afterward)
Disabled/Enabled A-XMP
Updated BIOS, Chipset drivers, sound card drivers. DDU reinstalled audio/gfx drivers.
Removed all USB devices except mouse/keyboard
Removed all but one monitor, tried different monitors.
Tested with another power supply from previous system of the same wattage: No effect
Temps never seem to increase above ~60C even under high load; I have a lot of cooling in place and I don't believe its a thermal issue.
I am really at my wits end with this. I thought I knew how to troubleshoot issues like this but I do not think I do. I would try to test it in safe mode, but that would require leaving it overnight due to how intermittent it is, and I'm not sure how I'd detect a crash like this in safe mode while I'm asleep. I would RMA but I don't even know which part to RMA!
Occasionally, instead of crashing to reboot instantly, an ntoskrnl.exe BSOD will show up, minidumps do not add any additional info but I can link them if necessary. I'm not even 100% certain these BSODs are related to my main issue.
CURRENT SYSTEM CONFIGURATION:
OS: Win 11
Motherboard: MSI Pro B650P-Wifi
PSU: Corsair RM850x - 850w
CPU: Ryzen 7 7800x3D w/ ARCTIC 420mm Radiator
RAM: Corsair VENGEANCE DDR5 2x32GB Kit 5200MHz
GPU: MSI Gaming RTX 4070 Super 12GB Ventus 3-Fan
SSD: Intel 750-Series 500GB PCIe SSD (NOT M.2 - PCIe slot SSD)