ASROCK H81TM-ITX Manual De Instrucciones página 19

2.3 Installing Memory Modules (SO-DIMM)
This motherboard provides two 204-pin DDR3 (Double Data Rate 3) SO-DIMM
slots.
It is not allowed to install a DDR or DDR2 memory module into a DDR3 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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