Lenovo System x3750 M4, Installation And Service Manual

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Table 10. DIMM population sequence for memory sparing mode (continued)
DIMMs
Number of
microprocessors
DIMM connector
population sequence
on the system board
DIMM connector
population sequence
on the optional
microprocessor and
memory expansion tray
3rd set 1 4, 5, 6
4th set 1 7, 8, 9
Two microprocessors
1st set 2 1, 2, 3, 13, 14, 15
2nd set 2 10, 11, 12, 22, 23, 24
3rd set 2 4, 5, 6, 16, 17, 18
4th set 2 7, 8, 9, 19, 20, 21
Four microprocessors
1st set 4 1, 2, 3, 13, 14, 15 25, 26, 27, 37, 38, 39
2nd set 4 10, 11, 12, 22, 23, 24 34, 35, 36, 46, 47, 48
3rd set 4 4, 5, 6, 16, 17, 18 28, 29, 30, 40, 41, 42
4th set 4 7, 8, 9, 19, 20, 21 31, 32, 33, 43, 44, 45
• The server supports a maximum of 24 DIMMs (single-rank, dual-rank, or quad-rank) on the base system
board. If you mix single-rank, dual-rank or quad-rank DIMMs in the server, quad-rank DIMMs must
be installed first.
Note: To determine the type of DIMM, see the label on the DIMM. The information on the label is in the
format xxxxx nRxxx PC3-xxxxx-xx-xx-xxx. The numeral in the sixth numerical position indicates whether
the DIMM is single-rank (n=1) or dual-rank (n=2).
• The following tables list the supported combinations of single-rank and dual-rank standard RDIMMs and
quad-rank LR-DIMMs that you can install in the server.
Note: In the following table, the location of the DIMMs in the memory channels are defined as follows:
Near DIMM: The DIMM in the memory channel that is the closest to the microprocessor.
Middle DIMM: The middle DIMM in the memory channel.
Far DIMM: The DIMM in the memory channel that is the farthest from the microprocessor.
The following table lists the supported combinations of ranked registered DIMMs (RDIMMs) that you
can install in the server.
Note: The server does not support the mixing of single and dual-rank RDIMMs with quad-rank LR-DIMMs.
Table 11. Supported combinations of ranked RDIMMs per memory channel
Configuration DIMM 1 (far DIMM) DIMM 2 (middle DIMM) DIMM 3 (near DIMM)
1 Single-rank Empty Empty
2 Dual-rank Empty Empty
3 Single-rank Single-rank Empty
4 Dual-rank Single-rank Empty
5 Dual-rank Dual-rank Empty
6 Single-rank Single-rank Single-rank
Chapter 2
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Installing optional devices
51