MSI X99S GAMING 9 AC - Manual (Page 28)

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Memory
These DIMM slots are used for installing memory modules.
DIMM1
DIMM2
DIMM3
DIMM4
DIMM8
DIMM7
DIMM6
DIMM5
Video Demonstration
Watch the video to learn how to install memory.
http://youtu.be/T03aDrJPyQs
Up to Quad-Channel mode
This motherboard 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.
Defined Channel list
Channel DIMM Slot
Channel A DIMM1, DIMM2
Channel B DIMM3, DIMM4
Channel C DIMM5, DIMM6
Channel D DIMM7, DIMM8
Important
• DDR4 memory modules are not interchangeable with DDR3, and the DDR4
standard is not backward compatible. Always install DDR4 memory modules in
DDR4 DIMM slots.
• Always insert memory modules in the DIMM1 slot first.
• 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.