• The server supports a maximum of 24 single-rank, dual-rank, or 16 quad-rank RDIMMs. The server does
not support three quad-rank RDIMMs in the same channel.
• The following table shows an example of the maximum amount of memory that you can install using
ranked DIMMs:
Table 4. Maximum memory installation using ranked DIMMs
Number of DIMMs
DIMM type
DIMM size
Total memory
16
Single-rank UDIMMs
2 GB
32 GB
24
Single-rank RDIMMs
2 GB
48 GB
24
Single-rank RDIMMs
4 GB
96 GB
24
Dual-rank RDIMMs
8 GB
192 GB
24
Dual-rank RDIMMs
16 GB
384 GB
16
Quad-rank RDIMMs
16 GB
256 GB
24
Quad-rank LRDIMMs
32 GB
768 GB
• The UDIMM option that is available for the server is 2 GB. The server supports a minimum of 2GB and a
maximum of 32 GB of system memory using UDIMMs.
• The RDIMM options that are available for the server are 2 GB, 4 GB, 8 GB, and 16 GB. The server
supports a minimum of 2 GB and a maximum of 384 GB of system memory using RDIMMs.
• The LRDIMM option that is available for the server is 32 GB. The server supports a minimum of 32 GB
and a maximum of 768 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 104.
• 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, UDIMM, 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.
• For UDIMMs, DIMM connectors 3, 6, 7, and 10 for microprocessor 1 and DIMM connectors 15, 18,
19, and 22 for microprocessor 2 are not used.
Note:
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.
The following illustration shows the location of the DIMM connectors on they system board.
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System x3500 M4 Installation and Service Guide
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