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Installing System Components 127
System Memory
You can upgrade your system memory to a maximum of 16 GB (for a one-
processor configuration) or 32 GB (for a two-processor configuration). You
can install 667-MHz registered parity DDR2 memory modules (DIMMs) in
sets of 512-MB, 1-GB, 2-GB, or 4-GB modules. The memory sockets are
located on the system board under the processor shroud and are split into two
separate groups of four sockets each. Each four-socket group is adjacent to its
respective processor.
General Memory Module Installation Guidelines
To ensure optimal performance of your system, observe the following
guidelines when configuring your system memory.
• Memory must be installed in configurations of two, four, or eight DIMMs.
The minimum configuration for a two-processor system is four DIMMs.
• DIMMs m
ust be installed in matched pairs of
identical speed,
technology, and size in the following pairs of sockets:
– DIMM A1 and DIMM A2
– DIMM A3 and DIMM A4
– DIMM B1 and DIMM B2
– DIMM B3 and DIMM B4
• Minimum configurations must occupy the lower-numbered sockets
(DIMM A1 and DIMM A2 for a one-processor configuration and also
DIMM B1 and DIMM B2 for a two-processor configuration).
Table 3-1 shows the available memory configurations following these
guidelines.