ASROCK X399M Taichi Manual Del Usuario página 23

2.3 Installation of Memory Modules (DIMM)
This motherboard provides four 288-pin DDR4 (Double Data Rate 4) DIMM slots,
and supports Quad Channel Memory Technology.
1. For dual channel configuration, you always need to install identical (the same
brand, speed, size and chip-type) DDR4 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, DDR2 or DDR3 memory module into a DDR4
slot; otherwise, this motherboard and DIMM may be damaged.
Memory Configuration
Option
DDR4_D1
DDR4_C1
DDR4_A1
DDR4_B1
• If only two memory modules are installed in the DDR4 DIMM slots, you can either
install the memory modules on DDR4_A1, DDR4_B1 or DDR4_C1, DDR4_D1.
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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