Installing Memory Modules (Dimm); Ddr4 Udimm Maximum Frequency Support - ASROCK B450 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

Ryzen Series CPUs (Pinnacle Ridge):
UDIMM Memory Slot
A1 A2 B1
- SR
- DR
- SR
- DR
SR SR SR
SR/DR DR SR/DR
Ryzen Series CPUs (Summit Ridge):
UDIMM Memory Slot
A1 A2 B1
- SR
- DR
- SR
- DR
SR SR SR
SR/DR DR SR/DR
Frequency
(Mhz)
B2
- - 2667
- - 2400
- SR 2667
- DR 2400
SR 2133
DR 1866
Frequency
(Mhz)
B2
- - 2667
- - 2667
- SR 2667
- DR 2400-2667
SR 2133-2400
DR 1866-2133
B450 Pro4
23