IBM 7944, Инструкция по установке и эксплуатации

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Table 9. Maximum memory installation using ranked DIMMs (continued)
Number of DIMMs
DIMM type
DIMM size
Total memory
12
Quad-rank RDIMMs 16 GB 192 GB
18 Dual-rank RDIMMs 16 GB 288 GB
• 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
Chapter 3
“Configuring the server ” on page 105 .
• 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.
Chapter 2
.
Installing optional devices
53