ASROCK Q1900TM-ITX Manual De Instrucciones página 12

2.1 Installing Memory Modules (SO-DIMM)
This motherboard provides two 204-pin DDR3/DDR3L (Double Data Rate 3) SO-
DIMM slots. Please install the SO-DIMM module into the DDR3_A1 for the first
priority.
It is not allowed to install a DDR or DDR2 memory module into a DDR3/DDR3L
slot; otherwise, this motherboard and SO-DIMM may be damaged.
The SO-DIMM only fits in one correct orientation. It will cause permanent damage
to the motherboard and the SO-DIMM if you force the SO-DIMM into the slot at
incorrect orientation.
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