Cisco Cisco UCS C240 M3 Rack Server 数据表

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DIMMs are required to be populated in pairs. DIMMs for this server are available as two-DIMM 
kits.

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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 
inaccessible.

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For optimal performance, distribute DIMMs evenly across all installed CPUs and memory 
buffers.

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Do not mix RDIMMs and LRDIMMs.

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DIMMs within a channel are populated starting with the DIMMs farthest from the memory 
buffer in a fill-farthest approach.

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Matched pairs of risers on paired DDR3 channels must have identical DIMM configurations.

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If any GPU is installed, the maximum amount of DIMM memory allowed in the server must be 
less than 1 TB (for example, UCS-MR-2X162RY-E (2x16 GB) cannot exceed a quantity of 30, or 
UCS-ML-2X324RY-E (2x32 GB) cannot exceed a quantity of 14, or UCS-MR-1X162RU-G (1x16 
GB) cannot exceed a quantity of 60, or UCS-MR-1X322RU-G (1x32 GB) cannot exceed a 
quantity of 28).

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If a system uses 64 GB DIMMs, the maximum ambient temperature is 32 °C (89.6 °F). In 
addition, systems with 64 GB DIMMs cannot implement any GPUs.

For more information about memory, see