ASROCK B550 Extreme4 Manual page 26

Ryzen Series APUs (Renoir):
UDIMM Memory Slot
A1 A2
- SR
- DR
- SR
- DR
SR SR
SR/DR DR
SR/DR SR/DR
SR: Single rank DIMM, 1Rx4 or 1Rx8 on DIMM module label
DR: Dual rank DIMM, 2Rx4 or 2Rx8 on DIMM module label
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Frequency
(Mhz)
B1 B2
- - 3200
- - 3200
- SR 3200
- DR 3200
SR SR 2933
SR/DR DR 2667
SR/DR SR/DR 2667