I think managing a 100mV undervolt is pretty common for the 13900K. That's what I have as well, with a power limit of 200W. The penalty in cinebench is only ~5%

I think managing a 100mV undervolt is pretty common for the 13900K. That's what I have as well, with a power limit of 200W. The penalty in cinebench is only ~5% despite the 20% reduction in power.