ASROCK H87M Pro4 Manual Del Usuario página 21

2.3 Installing Memory Modules (DIMM)
This motherboard provides four 240-pin DDR3 (Double Data Rate 3) 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) DDR3 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 or DDR2 memory module into a DDR3 slot;
otherwise, this motherboard and DIMM may be damaged.
Dual Channel Memory Configuration
Priority DDR3_A1
1
2 Populated
3 Populated
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.
DDR3_A2 DDR3_B1
Populated
Populated
Populated Populated
H87M Pro4
DDR3_B2
Populated
Populated
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