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Dell PowerEdge R905

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.

General Memory Module Installation Guidelines

To ensure optimal performance of your system, observe the following guidelines when configuring your system memory.

• Memory modules must 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).