MSI X99S GAMING 9 AC - Manual (Page 30)

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Quad-Channel mode
Installed DIMMs
(6 memory modules)
Diagram
DIMM1, DIMM2, DIMM3,
DIMM5, DIMM6, DIMM7
DIMM1
DIMM2
DIMM3
DIMM4
DIMM8
DIMM7
DIMM6
DIMM5
Installed DIMMs
(8 memory modules)
Diagram
DIMM1, DIMM2,
DIMM3, DIMM4,
DIMM5, DIMM6,
DIMM7, DIMM8
DIMM1
DIMM2
DIMM3
DIMM4
DIMM8
DIMM7
DIMM6
DIMM5
Important
To ensure system stability for Dual/ Triple/ Quad channel mode, memory modules
must be of the same type, number and density. And for every channel, the odd
number DIMM slot must to be installed first.