I undervolted my CPU about a year ago and haven’t had any issues with it till now. I’ve been dual booting Linux recently and noticed whenever I was in Linux it would crash/reboot after a couple of hours or less of using it. I noticed the behavior was similar to when I set the voltages too low when initially setting up the undervolt so I disabled it and haven’t had any crashed since. Any idea why it would be stable on Windows but not Linux? I tried a couple of different distros as well. I’ll probably just raise the voltage until I get it stable again but I’m interested to know what could cause this! If its relevant my CPU is a Ryzen 7 3800x
I’m on 6.4.12 so not the very latest but close. You did make me think to check the CPU frequency scaling though and I’ve spotted a couple of things it could be. I seem to be using the acpi-cpufreq driver rather than amd_pstate, not sure if its worth switching over? It also seems to be set to keep the frequency between 2.2-3.9GHz whereas on Windows my CPU almost always boosts to around 4.2-4.3. I might change that if I notice any performance issues but tbh I might leave it for now and see how things go. It might run a bit cooler if its not always boosting and I can probably still undervolt just not by as much
I’ve heard that amd_pstate is a lot more power efficient (thus cooler) compared to acpi.
Like I believe amd_pstate has a lot more states than acpi-cpufreq so it gives Linux much more granular control over the CPU’s performance.
I can validate that. Switched my NAS to amd_pstate, went from 2.12 kW.h per day to 1.95 kW.h per day.
hmm I might give it a try then, last time I mentioned it I was recommended to just stick with the defaults