Just as a heads up, this motherboard is NOT an 8-phase motherboard. It uses an Intersil ISL95712 setup in 3+2 mode. And since there are no doublers anywhere on the board, that “6-phase” Vcore is a 3-phase with parts running in parallel.
AHOC has a video detailing the phases of the B350 motherboard and my personal X370 motherboard has the exact same setup.
To be honest, I’m disappointed in ASRock with their advertising of this being “8-phase” when it is definitely not.