Hi bro, i been searching and reading about this issue a a lot.
B450 ds3h wifi
r5 3600
Vengeance RGB Pro DDR4 16 GB c18
Tired of trying frecuency, timmings and voltajes, i found a solution myself.
First of all let me tell you, this ddr are perfectly compatible
SOLUTION:
To activate xmp 2.0 and everything runs smooth and stable you have to disable POWER DOWN MODE
Thats all
Enjoy!!
pd:
you should find this setting: Peripherals> AMD CBS> DRAM Controller Configuration> DRAM Power Options> Power Down Mode (set disabled)