IBM System x3750 M4 Installation And Service Manual page 67

v 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 a 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).
v The following tables list the supported combinations of single-rank, dual-rank,
and quad-rank standard registered DIMMs (RDIMMs) and load-reduced DIMMs
(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 DIMMs
(RDIMMs) that you can install in the server.
Note: The server does not support the mixing of RDIMMs and LR-DIMMs in
the same server.
Table 12. Supported combinations of ranked RDIMMs per memory channel
Configuration DIMM 1 (far DIMM)
1 Single-rank
2 Dual-rank
3 Quad-rank
4 Single-rank
5 Dual-rank
6 Dual-rank
7 Quad-rank
8 Quad-rank
9 Quad-rank
10 Single-rank
11 Dual-rank
12 Dual-rank
13 Dual-rank
The following table lists the supported combinations of ranked load-reduced
DIMMs (LR-DIMMs) that you can install in the server.
Note: The server does not support the mixing of RDIMMs and LR-DIMMs in
the same server.
DIMM 2 (middle DIMM 3 (near
DIMM) DIMM)
Empty Empty
Empty Empty
Empty Empty
Single-rank Empty
Single-rank Empty
Dual-rank Empty
Single-rank Empty
Dual-rank Empty
Quad-rank Empty
Single-rank Single-rank
Single-rank Single-rank
Dual-rank Single-rank
Dual-rank Dual-rank
Chapter 2. Installing optional devices
49