Lenovo System x3750 M4, Installation And Service Manual

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Table 5. Maximum supported memory (continued)
Number of DIMM connectors Maximum memory
Total = 1.5 TB of memory
Note: The server can support a maximum 1.5 TB of system memory when the server is fully populated with 32
GB DIMMs and the optional microprocessor and memory expansion tray is installed and fully populated with 32
GB DIMMs.
• The DIMM options that are available for the server are 4 GB, 8 GB, 16 GB, and 32 GB.
• The server system board supports a minimum of 4 GB and a maximum of 768 GB of system memory.
However, the server can support an additional 768 GB of memory when an optional microprocessor and
memory expansion tray is installed in the server, for a total of 1.5 TB of system memory, depending on
the model.
Note: The amount of usable memory is reduced, depending on the system configuration. A certain
amount of memory must be reserved for system resources. To view the total amount of installed memory
and the amount of configured memory, run the Setup utility. For additional information, see “Configuring
the server” on page 132.
• The server system board provides four memory channels for each microprocessor, and
each memory channel supports up to three DIMMs. The optional microprocessor and
memory expansion tray also provides four memory channels that support up to three
DIMMs per channel. The following illustration shows the memory channels for each
microprocessor.
The following table lists the DIMM connectors on each memory channel for the microprocessors on the
system board and the optional expansion tray.
Table 6. Memory channel DIMM connectors
Memory channel
DIMM connectors
associated with
MP 1 on the system
board DIMM connectors
associated with
MP 2 on the system
board
DIMM connectors
associated with
MP 3 on the
microprocessor
and memory
expansion tray DIMM connectors
associated with
MP 4 on the
microprocessor and
memory expansion
tray
Channel 0 7, 8, 9 19, 20, 21 31, 32, 33 43, 44, 45
Channel 1
10, 11, 12 22, 23, 24 34, 35, 36 46, 47, 48
Channel 2 4, 5, 6 16, 17, 18 28, 29, 30 40, 41, 42
Channel 3 1, 2, 3 13, 14, 15 25, 26, 27 37, 38, 39
• The following table shows the DIMM connectors on the system board and the microprocessor and
memory expansion tray that are associated with each microprocessor.
Table 7. DIMM connectors associated with each microprocessor
Microprocessor Location
DIMM connectors associated with
the microprocessor
Microprocessor 1 System board 1 through 12
Microprocessor 2
System board
13 through 24
Chapter 2
.
Installing optional devices
47