Installing Memory Modules (Dimm); Ddr4 Udimm Maximum Frequency Support; Ryzen Cpus; A-Series Apus - ASROCK A320M Pro4 Manual

2.3 Installing Memory Modules (DIMM)

This motherboard provides four 288-pin DDR4 (Double Data Rate 4) DIMM slots,
and supports Dual Channel Memory Technology.
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 or three
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.

DDR4 UDIMM Maximum Frequency Support

A-Series APUs:

UDIMM Memory Slot
A1 A2
- SR
- DR
- SR
- DR
SR SR
SR/DR DR

Ryzen CPUs:

UDIMM Memory Slot
A1 A2
- SR
- DR
- SR
- DR
SR SR
SR/DR DR
SR: Single rank DIMM, 1Rx4 or 1Rx8 on DIMM module label
DR: Dual rank DIMM, 2Rx4 or 2Rx8 on DIMM module label
24
Frequency
(Mhz)
B1 B2
- - 2400
- - 2400
- SR 2400
- DR 2133
SR SR 1866
SR/DR DR 1866
Frequency
(Mhz)
B1 B2
- - 2667
- - 2667
- SR 2667
- DR 2400-2667
SR SR 2133-2400
SR/DR DR 1866-2133