DDR4 Standard Memory

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Technical Specifications
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General Memory Population Rules and Guidelines:
For HPE Gen9 Servers:
• Install DIMMs only if the corresponding processor is installed.
• If only one processor is installed in a two-processor system, only half of the DIMM slots are available.
• To maximize performance, it is recommended to balance the total memory capacity between all installed processors and
load the channels similarly whenever possible.
• When two processors are installed, balance the DIMMs across the two processors.
• White DIMM slots denote the first slot to be populated in a channel.
• Place the DIMMs with the highest number of ranks in the white slot when mixing DIMMs of different ranks on the same
channel.
• Mixing of DIMM types (UDIMM, RDIMM, and LRDIMM) is not supported. Mixing the 128GB LRDIMM with other capacities
is not supported. HPE Gen9 servers with Quad rank 2400MT/s LRDIMMs are capable of up to 3DPC.
• DIMMs of different speeds may be mixed in any order; the server will select a common optimal speed.
• The maximum memory speed is a function of the memory type, memory configuration, and processor model.
• The maximum memory capacity is a function of the memory type and number of installed processor.
To enable Mirrored Memory mode, the system allocates half of the installed memory as system memory and the remaining
half as mirrored memory.
• All memory channels must be configured identically.
• For HPE Gen9 servers, only an RDIMM can be mixed with HPE NVDIMM
• When installing NVDIMM(s) on the same memory channel as RDIMM(s), populate the RDIMM(s) first and farthest from the
processor, then populate the NVDIMM(s) last and closer to the processor.
For HPE Gen10 Servers:
• Install DIMMs only if the corresponding processor is installed.
• If only one processor is installed in a two-processor system, only half of the DIMM slots are available.
• To maximize performance, it is recommended to balance the total memory capacity between all installed processors.
• When two processors are installed, balance the DIMMs across the two processors.
• White DIMM slots denote the first slot to be populated in a channel.
• Mixing of DIMM types (UDIMM, RDIMM, and LRDIMM) is not supported.
• The maximum memory speed is a function of the memory type, memory configuration, and processor model.
• The maximum memory capacity is a function of the number of DIMM slots on the platform, the largest DIMM capacity
qualified on the platform, and the number and model of installed processors qualified on the platform.
For details on the HPE Server Memory Options Population Rules, visit:
http://www.hpe.com/docs/memory-population-rules