ASROCK Z87 OC Formula Handbuch Seite 27

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
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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.
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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.
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