Lenovo ThinkServer RD240 Installation And User Manual page 37

http://www.lenovo.com/thinkserver. On the ThinkServer systems page, click
Products → Options → ThinkServer Memory.
Memory module installation rules
Your server has eight memory slots for installing or replacing DDR3 SDRAM
DIMMs that provide up to a maximum of 64 GB of system memory.
The following tables provide information about the memory module installation
rules that you should consider when installing a memory module. The "X" mark
indicates the suggested memory slot(s) into which the memory module(s) should
be installed in different situations. The number, for example 1, 2, or 3, indicates the
installation sequence. See "Locating parts on the system board" on page 15 to
identify the various memory slots.
Note: All memory module types and capacities must be consistent.
Table 8. DIMM installation rules when a single microprocessor (CPU0) is installed
DIMM slot One DIMM
CPU0 DIMM
CHA1
CPU0 DIMM
CHA0
CPU0 DIMM
CHB0
CPU0 DIMM
CHC0
Note: Installing DIMMs on channel A and channel B of CPU0 should enable Channel
Mirroring Mode. This mode requires that you install the DIMMs in pair, and the DIMM
installation for Channel Mirroring Mode is one DIMM on CPU0 DIMM CHA0 and one
DIMM on CPU0 DIMM CHB0 when a single microprocessor (CPU0) is installed.
Table 9. DIMM installation rules when two microprocessors (CPU0 and CPU1) are installed
DIMM slot Two DIMMs
CPU0 DIMM
CHA1
CPU0 DIMM
CHA0
CPU0 DIMM
CHB0
CPU0 DIMM
CHC0
CPU1 DIMM
CHA1
CPU1 DIMM
CHA0
CPU1 DIMM
CHB0
CPU1 DIMM
CHC0
Two DIMMs
X X, 1
X, 2
Four DIMMs
X, 1 X, 1
X, 3
X, 2 X, 2
X, 4
Chapter 5. Installing, removing, or replacing hardware
Three DIMMs Four DIMMs
X, 4
X, 1 X, 1
X, 2 X, 2
X, 3 X, 3
Six DIMMs Eight DIMMs
X, 7
X, 1 X, 1
X, 3 X, 3
X, 5 X, 5
X, 8
X, 2 X, 2
X, 4 X, 4
X, 6 X, 6
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