ASROCK J4105M Mode D'emploi page 12

2.1 Installing Memory Modules (DIMM)
This motherboard provides two 288-pin DDR4 (Double Data Rate 4) DIMM slots, and
supports Dual Channel Memory Technology.
1. 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.
2. The DIMM only fits in one correct orientation. It will cause permanent damage to
the motherboard and the DIMM if you force the DIMM into the slot at incorrect
orientation.
Supported DDR4 Non ECC DIMM
Raw Card
A (1Rx8)
B (2Rx8)
C (1Rx16)
Dual Channel Memory Configuration
DDR4_A1
DDR4_A2
10
Populated
Populated