i have a Ryzen 5 1600. My Mainboard is the MSI PC Mate.I have clean windows and installed all Drivers manually and updated my BIOS to AGESA Code 220.127.116.11b. I downloaded Ryzen Master, but didn´t overclocked the CPU. the Problem: Sometimes fixed clock at 1550 Mhz. If I restart the PC goes back to normal 3,2 Ghz. One time it even was stuck at 3,4 Ghz.
Thanks for your help.