>I made a machine with a Ryzen 9900X a while back and it had the issue that it would freeze when idling

I also have this issue.

If you are on Linux, there are long time known problems with low power cpu states. These states can be entered by your CPU when under low/no load.

A common approach is to go into the BIOS/UEFI settings and check that c6 is disabled. To verify and/or temporarily turn c6 off, see https://github.com/r4m0n/ZenStates-Linux

	▲	hedora 4 days ago \| parent [-]
		It’s also worth checking all the autodetected stuff that can be overclocked, like ram speed. That stuff can be wrong, and then you get crazy but similar bugs in linux and windows.

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InMice 4 days ago | parent | prev [-]

You could try using powerprofilesctl to change the mode from 'balanced' or 'power saver' to 'performance' since i think this may prevent the cpu from ever entering the throttled down low idle states that your freezing happens in. they are controlled with powerprofilesctl. You may also be able to add some flugs to grub config file. assuming you are using linux i guess.

	▲	protocolture 3 days ago \| parent [-]
		I have set my timings manually in the bios, and disabled most advanced CPU features for stability. If I enable virtualisation, the issue can be replicated within 15 minutes of boot. But with basically half the CPU set to do nothing, and all features disabled its once a week max. Which sucks because I basically live in WSL.