MSI X99S GAMING 9 AC Guide Rapide page 30

Installed DIMMs
(6 memory modules)
DIMM1, DIMM2, DIMM3,
DIMM5, DIMM6, DIMM7
Installed DIMMs
(8 memory modules)
DIMM1, DIMM2,
DIMM3, DIMM4,
DIMM5, DIMM6,
DIMM7, DIMM8
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.
Quad-Channel mode
Diagram
Diagram
En-16
DIMM1
DIMM2
DIMM3
DIMM4
DIMM8
DIMM7
DIMM6
DIMM5
DIMM1
DIMM2
DIMM3
DIMM4
DIMM8
DIMM7
DIMM6
DIMM5