What motherboard and BIOS do you have? In most cases it is the motherboard's BIOS version that limits the RAM clocks on Ryzen.
Asrock x370 Taichi - BIOS 3.00
In this case, the motherboard is not limiting the RAM clock speed. I select 3600 from the BIOS and it runs with 100% stability. The BIOS lets me select up to 4000.
I would just overclock from the BIOS and not use Ryzen Master but I have run into the 15.5x multiplier (1550Mhz clock speed) bug when using the BIOS. I can run memory at 3600 but the CPU runs at 1550Mhz.
I was hoping to just use Ryzen Master to overclock but now I can't get the memory to run at its rated speed of 3600.
3200Mhz is the max supported at the moment.