I'm not sure if this is set by Asrock or if it's the nature of PBO, but enabling PBO dramatically raises the voltage the CPU sees under load to above what most consider safe. Running a small FFT P95 under stock conditions the CPU will be under massive load and only volts to around 1.28v. Cinebench C15 and C20 stay at 1.325v which is what I've read is the max safe voltage. With PBO enabled with motherboard specs, I saw a massive 1.375v during P95 and 1.42v under Cinebench runs. Perhaps this higher voltage is only temporary and it's working as intended, or maybe it's on Asrock's configuration of PBO. I'm going to leave PBO off though I think.
RYZEN 3700x - 2x 8GB Corsair RGB Hynix @ 3600 C16 - GTX 1080 Ti Aorus WB
Asrock Taichi X370 - Corsair AX850 - Phanteks Enthoo Pro M
EK Supremacy EVO - D5 Revo 140 - PE 360 - PE 240
Dell AW3418DW Ultrawide Monitor