ASROCK Fatal1ty X399 Professional Gaming Serie Manual Del Usuario página 24

2.3 Installation of Memory Modules (DIMM)
This motherboard provides eight 288-pin DDR4 (Double Data Rate 4) DIMM slots, and
supports Quad Channel Memory Technology.
1. For quad channel configuration, you always need to install identical (the same brand,
speed, size and chip-type) DDR4 DIMM pairs.
2. It is not allowed to install a DDR, DDR2 or DDR3 memory module into a DDR4 slot;
otherwise, this motherboard and DIMM may be damaged.
3. 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.
Memory Configuration
Priority
DDR4_D2
DDR4_D1
DDR4_C2
DDR4_C1
DDR4_A1
DDR4_A2
DDR4_B1
DDR4_B2
D2 D1 C2 C1
20
2 - DIMM 4 - DIMM
1
Populated
Populated
Populated Populated
Populated Populated
8 - DIMM
2 3
Populated
Populated
Populated
Populated
Populated
Populated
Populated
Populated
A1 A2 B1 B2