I run OCCT for 1 hour, several times, and it proved to be stable. Ran several sessions of Memtest86 400% to 600%, all of the tests from #1 to #13, again several times and it was stable. Ran several sessions of TM5 with anta777 profile (which is said to be extremely effective) and had zero errors all of the times. All of these tests validated extreme OCs with tight timings, too. On the other hand, macOS locked even with XMP profile OFF and no changes in BIOS after the usual mandatory settings. I am so annoyed.
Yeah OCCT is fine, it uses similar algos to P95 anyway for the CPU / Ram tests. You can rule out CPU / Mobo / Ram / PSU right away.
All you have left is GPU, Disk, BIOS, or least likely IMO an incapability with OC and your chipset/mobo I say least likely since your board is basically part identical to mine and many other boards.
GPU is a nightmare to test, I mean you could try Furmark, but I really doubt it would be this unless the GPU is somehow tripping the PSU which can cause lockups. Funnily enough spikey workloads is more likely to cause this than consistent power draw like in FurMark, but that is really hard to emulate.
Disk... well only way to test this is by elimination thanks to Monterey / macOS. If you can get a hold of a SATA drive even a really small one just to test the system I would give that a go that would completely identify if it is a controller/chipset issue from the M.2 drives you are using since SATA is always AHCI to macOS regardless of the controller on the drive.
BIOS, this is worst case since you can really only just try each one and see what happens saying that I have used F2, F3a, F3, and F20b on my board all with zero issues and the BIOS are pretty standardized now days.
I'll try some other tests but I doubt I will find anything different.
I agree I doubt you will.
Sure, it turned out to be effective in your situation, but I just reinstalled everything earlier this morning... what the hell.
Yes this kind of problem is extremely frustrating.
Been having lock ups way before Safari 16 came out :/ since the mid of Aug
If you are using Safari at all I would just stop though, even running in the background I found it could cause lockups. I can't confirm exactly when this issue started, it was around Aug/Sept for me but that is just when I started doing Testing for the work project I am doing and it took me a couple of weeks to work out that it was Safari causing this. Since then I found a lot of threads by real Mac users reporting this issue.