ASROCK A320M, User Manual

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2.3 Installing Memory Modules (DIMM)
This motherboard provides two 288-pin DDR4 (Double Data Rate 4) DIMM slots,
and supports Dual Channel Memory Technology.
DDR4 UDIMM Maximum Frequency Support
A-Series APUs:
Ryzen CPUs:
SR: Single rank DIMM, 1Rx4 or 1Rx8 on DIMM module label
DR: Dual rank DIMM, 2Rx4 or 2Rx8 on DIMM module label
1. For dual channel configuration, you always need to install identical (the same
brand, speed, size and chip-type) DDR4 DIMM pairs.
2. It is unable to activate Dual Channel Memory Technology with only one memory
module installed.
3. It is not allowed to install a DDR, DDR2 or DDR3 memory module into a DDR4
slot; otherwise, this motherboard and DIMM may be damaged.
UDIMM Memory Slot
Frequency
(Mhz)
A1 B1
- SR 2400
SR - 2400
- DR 2400
DR - 2400
SR SR 2400
DR DR 2400
UDIMM Memory Slot
Frequency
(Mhz)
A1 B1
- SR 2667
SR - 2667
- DR 2667
DR - 2667
SR SR 2667
DR DR 2667