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Table 15. Maximum memory installation using ranked DIMMs (continued)
Number of DIMMs
18
12
18
• 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 288 GB of system memory using RDIMMs. For 32-bit
operating systems only: Some memory is reserved for various system resources and is unavailable to
the operating system. The amount of memory that is reserved for system resources depends on the
operating system, the configuration of the server, and the configured PCI devices.
• The UDIMM options that are available for the server are 2 GB and 4 GB. The server supports a minimum of
2 GB and a maximum of 48 GB of system memory using UDIMMs.
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
the server " on page
• 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 three DIMMs for each microprocessor.
• DIMMs in the same channel must be the same type (RDIMM or UDIMM) to ensure that the server will
operate correctly.
• When you install one quad-rank RDIMM in a channel, install it in the DIMM connector furthest away from
the microprocessor.
• Do not install one quad-rank RDIMM in one channel and three RDIMMs in another channel.
The following illustration shows the location of the DIMM connectors on the system board.
System x3550 M3Problem Determination and Service Guide
432
DIMM type
Dual-rank RDIMMs
Quad-rank RDIMMs
Dual-rank RDIMMs
514.
DIMM size
8 GB
16 GB
16 GB
Total memory
144 GB
192 GB
288 GB
"Configuring
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