ASROCK A320TM-ITX, User Manual, Page: 19 / 57

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2.3 Installing Memory Modules (SO-DIMM)
This motherboard provides two 260-pin DDR4 (Double Data Rate 4) SO-DIMM
slots.
Be sure to install the memory module into the DDR4_A2 slot as first priority;
otherwise, the system may not boot up properly or may operate incorrectly.
It is not allowed to install a DDR, DDR2 or DDR3 memory module into a DDR4 slot;
otherwise, this motherboard and SO-DIMM may be damaged.
DDR4_A2
DDR4_A1