Dell PowerEdge R905 Owner's Manual download pdf (Page 94)

94 Installing System Components

System Memory

You can upgrade your system memory to a maximum of 128 GB (two-

processor configurations) or 256 GB (four-processor configurations) by

installing sets of 512-MB, 1-GB, 2-GB, 4-GB, or 8-Gb (when available)

memory modules. 667-MHz registered DDR-II memory modules are

supported in all memory sizes. 2-GB and 4-GB (when available) 800-Mhz

memory modules are also supported in restricted configurations.

Sixteen memory sockets are located on the system board under the cooling

shroud assembly. In four-processor systems, sixteen additional sockets are

located on the processor expansion module board (PEM). Each processor has

two memory channels, organized in sets of four memory module slots per

channel.

Your system hardware supports Non-Uniform Memory Architecture (NUMA).

Each processor has its own memory controller and local memory for reduced

access times, but it can also access memory from another processor. This

architecture improves system performance if an operating system is installed

that supports this feature.

NOTICE: To enable NUMA, run the System Setup program and disable the Node

Interleaving option. See "Using the System Setup Program" on page 45.

General Memory Module Installation Guidelines

To ensure optimal performance of your system, observe the following

guidelines when configuring your system memory.

• Memory modules m

ust be installed in pairs

, beginning with the first two

sockets in each set of memory modules. These sockets are marked by white

retention levers.

• All memory modules must be identical in speed and technology. The two

memory modules in each pair must be the same size.

Memory can either be installed in a two-processor configuration (Table 3-1)

or a four-processor configuration (Table 3-2).

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Dell PowerEdge R905 Owner's Manual Page 94