Cisco UCS C460 M2 User Manual page 17

Caveats
Each CPU controls four DDR3 channels.
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The minimum DIMM configuration is at least one matched DIMM pair installed in a memory
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riser on either CPU1 or CPU2. All four CPUs can run from a single DIMM pair.
DIMMs are required to be populated in pairs. DIMMs for this server are available as two-DIMM
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kits.
The DIMMs in any given pair must be identical.
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Any DIMM installed in a memory riser corresponding to an empty CPU slot becomes
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inaccessible.
For optimal performance, distribute DIMMs evenly across all installed CPUs and memory
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buffers.
DIMMs within a channel are populated starting with the DIMMs farthest from the memory
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buffer in a fill-farthest approach.
Matched pairs of risers on paired DDR3 channels must have identical DIMM configurations.
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For more information about memory, see
Cisco UCS C460 M2 High-Performance Rack-Mount Server
CPUs and DIMMs on page
CONFIGURING the SERVER
49.
17