Hardware Owner's Manual

212 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 start-up 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 3-15 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.
Table 3-15. 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