Dell PowerEdge M605 - Manual (Page 114)

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Installing Blade Components
Non-Optimal Memory Configurations
System performance can be affected if your memory configuration does not
conform to the preceding installation guidelines. Your system may issue an
error message during startup stating that your memory configuration is non-
optimal.
Memory Sparing Support - PowerEdge M600
Memory sparing requires eight identical memory modules. The memory sparing
feature must also be enabled in the System Setup program, and can be used
only if memory mirroring is not enabled.
Table 3-6 shows how memory sparing splits the available and spared memory
in each memory module configuration.
Memory Mirroring Support - PowerEdge M600
The system supports memory mirroring if eight identical memory modules are
installed in the system. Mirroring must be enabled in the System Setup program
and can be used only if memory sparing is not enabled. In a mirrored
configuration, the total available system memory is one-half of the total
installed memory.
System Memory - PowerEdge M605
You can upgrade your system memory to a maximum of 16 GB (single
processor) or 32 GB (dual processors) by installing 667- or 800-MHz
registered DDR2 memory modules in sets of 512-MB, 1-GB, 2-GB, 4-GB, or
8-GB modules. Each processor has four memory channels, organized in sets of
two channels.
Table 3-6. Memory Sparing Configurations - PowerEdge M600
DIMMs Size/Type Total Memory Available Spare
8 512-MB 4 GB 2 GB 2 GB
8 1-GB single-rank 8 GB 4 GB 4 GB
8 2-GB dual-rank 16 GB 12 GB 4 GB
8 4-GB dual-rank 32 GB 24 GB 8 GB