User`s manual

Chapter 1
1-16
Getting Started
Memory
These DIMM slots are used for installing memory modules.
DIMM1
DIMM2

DIMM4
DIMM8
DIMM7
DIMM6
DIMM5
Video Demonstration
Watch the video to learn how to install memory.

Up to Quad-Channel mode
This mainboard supports up to four memory channels. Two DIMM slots provide a
single channel. The memory modules can transmit and receive data with four data bus
channels simultaneously to enhance system performance. Please refer the following
tables for more details.

Channel DIMM Slot
Channel A DIMM1, DIMM2
Channel B 
Channel C DIMM5, DIMM6
Channel D DIMM7, DIMM8
Important
 
standard is not backward compatible. Always install DDR4 memory modules in
DDR4 DIMM slots.
 
 Due to chipset resource usage, the system will only detect up to 127+ GB of
memory (not full 128 GB) when all DIMM slots have 16GB memory modules
installed.