Perhaps it is caused by the DVD drive
Nothing conclusive yet (will probably take a few more days of not seeing the problem to be confident), but in the period of time that I could previously reproduce the problem, I cannot reproduce the problem after disconnecting the DVD drive.
The DVD drive is fairly old so one theory is that it requires some driver that is missing or just has some compatibility issues with modern hardware. It works fine right after booting (I used it to install Windows).
Another theory is that my motherboard has 8 SATA ports. 6 are part of the Z390 chipset (Intel) and 2 are from an ASMedia chip. The DVD drive was plugged into one of the ASMedia ports and I see that I don't have an ASMedia-specific SATA controller or driver (ASRock doesn't offer one on their drivers page). Not sure if that matters or not.
Anyway, I'll have to go a couple more days without seeing the problem. Then, I'll have to put my overclocks back and go a few more days to be confident. If this is the issue, I'll just replace the DVD drive with a new one or evaluate going without one.
(-1 AVX offset) on ASRock Z390 Taichi
with Noctua NH-D15 air cooler
CPU offset voltage of -25mv, runs VRVout 1.240-1.313V on full AVX load, 1.225-1.275V on non-AVX load
2x8GB [email protected] at 1.45V
, G.Skill F4-3733C17Q-32GTZKK (XMP rated [email protected]
EVGA GTX 1060 6GB OC with Corsair RMx 750W power supply
Samsung 970 EVO 500GB NVMe boot SSD and four other drives all in a Fractal Design R6 Case