I ran several times Aida64 stress test on my Ryzen 9800X3D with -15 undervolt and each time it failed in the first 10 minutes with the message "hardware failure detected".
I ran the test with -12 undervolt for over one hour with no errors then I stopped the test. I guess it should be fully stable with -10 undervolt.
I see people online saying they run their 9800X3D fully stable with -20 undervolt or even more. I wonder if their CPUs are fully stable during stress test or just under normal use.
My CPU runs stable with -15 undervolt in games and Cinebench R23 but fails quickly in Aida64.