After upgrading from Ryzen 7 1700X to Ryzen 5 3500X, I updated Ryzen Master to the latest available version (as of 26 Dec 2019), and after rebooting, Windows 7 would BSOD in AMDRyzenMasterDriver.sys. I disabled the driver from safe mode.
CPU: Ryzen 5 3500X, no manual overclocking
RAM: Corsair CMK16GX4M2B3200C16 (2x8GB DDR4-3200 CL16, downclocked to 2800Mhz, physical slots 2 and 4)
Mobo: ASUS Prime B350-plus
OS drive: a 240GB SSD, M.2 SATA WDC WDS2 40G1G0B-00RC30