ASRock Z87 Extreme4__TB4 - Manual (Page 22)

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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.
Dual Channel Memory Configuration
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.
Priority DDR3_A1 DDR3_A2 DDR3_B1 DDR3_B2
1 Populated Populated
2 Populated Populated
3 Populated Populated Populated Populated
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.