ASROCK X99 Taichi, Manual, Page: 20 / 183

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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.
Quad Channel Memory Configuration
Priority 1 2
DDR4_A1 Populated Populated
DDR4_A2
Populated
DDR4_B1 Populated Populated
DDR4_B2 Populated
DDR4_C1 Populated Populated
DDR4_C2
Populated
DDR4_D1 Populated Populated
DDR4_D2 Populated
•
Due to Intel® CPU spec definition, please install the memory modules on DDR4_A1,
DDR4_B1, DDR4_C1 and DDR4_D1 for first priority. If the four DDR4 DIMM slots
above are fully installed, and you want to use more than four memory modules, please
install the other memory modules from left to right (from DDR4_A2, DDR4_B2,
DDR4_D2 to DDR4_C2.)
•
If only two memory modules are installed in the DDR4 DIMM slots, then Dual
Channel Memory Technology is activated. If three memory modules are installed, then
Triple Channel Memory Technology is activated. If more than four memory modules
are installed in the DDR4 DIMM slots, then Quad Channel Memory Technology is
activated.
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.