ASROCK FM2A78M Pro3+, User Manual

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2.3 Installation of Memory Modules (DIMM)
This motherboard provides four 240-pin DDR3 (Double Data Rate 3) DIMM
slots, and supports Dual Channel Memory Technology.
Dual Channel Memory Coniguration
The DIMM only its in one correct orientation. It will cause permanent dam
-
age to the motherboard and the DIMM if you force the DIMM into the slot at
incorrect orientation.
Priority DDR3_A1 DDR3_A2 DDR3_B1 DDR3_B2
1 Populated Populated
2 Populated Populated
3 Populated Populated Populated Populated
1.
For dual channel coniguration, 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.
4.
If you adopt DDR3 2400/2133/1866/1600 memory modules on this moth
-
erboard, it is recommended to install them on DDR3_A2 and DDR3_B2
slots.