Very often, when Windows crashes due to hardware shenanigans, it writes a minidump into c:/Windows/Minidump folder. You can use WinDbg to see what happened. Sometimes the problem is faulty RAM or similar random fails, nothing interesting there, but more often the problem is specific piece of hardware, the minidump then tells which driver has crashed and what it was doing when it happened.

Counter anecdote, but I run the Ryzen 9 5950X on dedicated servers with Ubuntu 20.04, and they are as stable as they should be.

Funny, never had an issue with mine. Bad stick of ram caused a few issues, but when it was replaced all’s been well.

I have a 5950X as well and it's only mostly stable. I've been running at stock with just PBO enabled and it's mostly fine. It's not so unstable I regret building it since it almost always only reboots and logs a WHEA error when I'm not using it for some reason.

For sudden reboot issues, could be some power protections tripping? For me that showed up as shutdowns (that require turning the PSU off for a minute), but maybe depending on various components and could result in reboots as well?

PBO seems to result in some wild power spikes that don't ever happen with manual static OC. Try raising various overcurrent limits, that worked for me.

Not sure, it only happens though (9.9/10) when the system is idle so it could still be power delivery related but in the other direction.

I have a 5800X and I hadn’t even heard of it. But the supply chain thing seems plausible — it’s still hard to get your hands on Zen 3.

Wow. Hope it gets fixed soon. I’d be livid about this even if I only used the machine in the off hours.

I installed the new beta BIOS update a week ago and since then my machine is been ROCK solid.

Interestingly, my fan is running harder now; whilst CPU usage is low but spiking on 1-2 cores. It never did that before; so maybe the problem was caused by a thermal bug in the bios.

It tends to crash when idle, and the machine is such an enormous improvement over anything Intel have made that I'm happy overall.

The issues with the BIOS will be solved and I'm not an overclocker.

Must be Windows since I never had problems with my Pop!_OS installation

lucky me never had issues with my 5950x (windows, x570 taichi). That being said, TDP 105w is bs.

Oh nooooo, your new top-of-the-line processor has a lower TDP than average-good processors from a few years ago! How absolutely horrible.

/s, in case that wasn't blatantly obvious.

That is not the issue, the issue is that AMD advertise 2700x and 5950x with the same TDP, so at the very least that should means that they both work fine when using the same cooling solution, which is not the case. Using my previous cooler 5950x was throttling at 100 Celsius.

TDP is just now a marketing term. We all know that the real value is when the CPU is boosted.