Installation Of Memory Modules (Dimm) - ASROCK Rack C2750D4I User Manual

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.
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
DDR3_A1
Priority
(Blue)
1 Populated
2 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
(White)
Populated
Populated Populated
20
DDR3_B2
(Blue) (White)
Populated