Lenovo System x3650 M5 Installation And Service Manual page 185

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• The maximum memory speed is determined by the combination of the microprocessor, DIMM speed,

DIMM type, Operating Modes in UEFI settings, and the number of DIMMs installed in each channel.

• The server supports a maximum of 24 single-rank, dual-rank RDIMMs or 24 quad-rank LRIMMs.

• The following table shows an example of the maximum amount of memory that you can install using

ranked DIMMs:

Table 11. Maximum memory installation using ranked DIMMs

Number of DIMMs

• The RDIMM options that are available for the server are 8 GB, 16 GB, and 32 GB. The server supports a

minimum of 8 GB and a maximum of 768 GB of system memory using RDIMMs.

• The LRDIMM option that is available for the server is 64 GB. The server supports a minimum of 64 GB

and a maximum of 1.5 TB of system memory using LRDIMMs.

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 50.

• A minimum of one DIMM must be installed for each microprocessor. For example, you must install a

minimum of two DIMMs if the server has two microprocessors installed. However, to improve system

performance, install a minimum of four DIMMs for each microprocessor.

• DIMMs in the server must be the same type (RDIMM or LRDIMM) to ensure that the server will operate

1. You can install DIMMs for microprocessor 2 as soon as you install microprocessor 2; you do not have

to wait until all of the DIMM slots for microprocessor 1 are filled.

2. DIMM slots 13-24 are reserved for microprocessor 2; thus, DIMM slots 13-24 are enabled when

microprocessor 2 is installed.

The following illustration shows the location of the DIMM connectors on the system board.

Single-rank RDIMMs

Dual-rank RDIMMs

Quad-rank LRDIMMs

Installing, removing, and replacing components

Total memory

Troubleshooting