The various bios for AM5 boards have some weird issues. My MSI board causes the FCLK to jump to to 2500MHz if i do anything in the bios. Even if i manually set the value to the default 1800, as soon as i'm out of the bios the FCLK will change to 2500 which causes total system instability until i clear CMOS. Even with the latest bios update nothing changes.