Lenovo System x3550 M5 Installation And Service Manual page 176

Table 25. Maximum memory installation (continued)
Number of DIMMs
24
24
24
• 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 1536 GB 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 34.
• 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
correctly.
• When you install one quad-rank DIMM in a channel, install it in the DIMM connector furthest away from
the microprocessor.
Notes:
– 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.
– DIMM slots 13-24 are reserved for microprocessor 2; thus, DIMM slots 13-24 are enabled when
microprocessor 2 is installed.
• Read the following table before installing memory modules when any NVIDIA adapter is installed.
Table 26. NVIDIA video adapter configurations
Description
NVIDIA Quadro K420, K600, and K620
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Lenovo System x3550 M5 Installation and Service Guide
DIMM type
Dual-rank RDIMM
Dual-rank RDIMM
Quad-rank LRDIMM
Size
16 GB
32 GB
64 GB
Supported maximum total memory size
1 TB
Total memory
384 GB
768 GB
1536 GB