- CPU: Ryzen 9 3900X
- CPU Cooler: Noctua NH-D15 Chromax Black
- Thermal Compound: Noctua NT-H2
- GPU: Zotac RTX 2070 Mini
- RAM: 2x 16 GB G.Skill Ripjaws V 3600 MHz CL16
- Mobo: ASUS ROG Strix B550-F, BIOS Ver. 1202, AGESA 1.1.0.0 Patch B
- PSU: Corsair CX 650 2017 80+ Bronze Non-Modular
- Storage: 1x 500 GB Samsung 980 PRO PCIe 4.0 NVMe + 1x SanDisk X400 512 GB SSD + 2x Crucial MX500 1 TB SSD
- Case: be quiet! Pure Base 500DX Black
- Airflow: 3x be quiet! Pure Wings 2 High-Speed 140mm PWM, 2x front intake, 1x rear exhaust
- Displays: 1x 1080p144, 1x 1080p75
- OS: Windows 10 Pro 20H2 (19042.630)
- Mouse: Razer Mamba Elite
- Keyboard: ROCCAT Horde AIMO
I have been having issues with idle hard reboots on this Ryzen system, when C-states are enabled. It doesn't happen with them disabled.
At first, I thought it was my PSU. Which it wasn't - it happens with another PSU still.
Before getting a ROG Strix board (because my Gigabyte board died - long story), I had a B550 Aorus Pro as my first Ryzen system and Corsair Vengeance LPX 3200 CL16 RAM. The CPU, PSU and GPU remained unchanged. GPU is not causing this -- tested with my old HP GTX 1060, same problem.
These shutdowns were happening on that system as well, and they continue on this system.
To fix this, I tried to bump the voltage on my DRAM to 1.37v from 1.35v thinking this is a DRAM issue and my memory controller is just weak.
That seemed to have fixed the issue, except it barely did. Sure, it doesn't shut down on full idle anymore with all non-essential processes closed, but instead it does this:

All of these errors are the exact same. They happened overnight while I left the PC to idle.
When I saw these errors, I thought maybe my SoC needs more voltage and so I increased the voltage from 1.1v to 1.125v, causing HWiNFO to report 1.106-1.119v SoC voltage in Windows from the previous 1.081v - 1.087v.
This didn't fix anything, and it in fact made things worse as my PC was now rebooting again. Set SoC back to Auto and from what I've seen it doesn't reboot anymore. I have yet to see WHEA errors again, but I'm sure they'll appear again overnight.
These errors don't happen all the time, only when the PC is left idle overnight, happens like 7 times per night.
I have no idea what to do to fix this anymore. There is a beta BIOS for my board which includes AGESA 1.1.0.0 Patch C, but I'm afraid to update to that. I'll wait until it gets out of Beta.
Does anybody else have these issues or is it just me?