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FusionServer Pro XH321 V5 Server Node V100R005 Maintenance and Service Guide 07

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Memory Compatibility

Memory Compatibility

Observe the following rules when configuring DDR4 memory modules:

  • A server must use the same model of DDR4 memory modules, and all the memory modules operate at the same speed, which is the smallest value of:
    • Memory speed supported by a processor
    • Maximum operating speed of a memory module
  • The DDR4 memory modules of different types (RDIMM and LRDIMM) and specifications (capacity, bit width, rank, and height) cannot be used together.
  • Contact your local Huawei sales representative or use the Intelligent Computing Compatibility Checker to determine the components to be used.
  • The memory can be used with Intel® Xeon® Scalable Skylake and Cascade Lake processors. The maximum memory capacity supported varies depending on the processor model.
    • Skylake processors
      • M processors: 1.5 TB/socket
      • Other processors: 768 GB/socket
    • Cascade Lake processors
      • L processors: 4.5 TB/socket
      • M processors: 2 TB/socket
      • Other processors: 1 TB/socket
  • The total memory capacity is the sum of the capacity of all DDR4 memory modules.

    The total memory capacity cannot exceed the maximum memory capacity supported by the CPUs.

  • Use the Intelligent Computing Compatibility Checker to determine the capacity type of a single memory module.
  • The maximum number of memory modules supported by a server varies depending on the CPU type, memory type, rank quantity, and operating voltage.

    Each memory channel supports a maximum of 8 ranks. The number of memory modules supported by each channel varies depending on the number of ranks supported by each channel:

    Number of memory modules supported by each channel ≤ Number of ranks supported by each memory channel/Number of ranks supported by each memory module

  • A memory channel supports more than eight ranks for LRDIMMs.

    A quad-rank LRDIMM generates the same electrical load as a single-rank RDIMM on a memory bus.

Table 2-5 DDR4 memory specifications

Parameter

Specifications

Maximum capacity per DDR4 memory module (GB)

64

Rated speed (MT/s)

2933

Operating voltage (V)

1.2

Maximum number of DDR4 memory modules in a nodea

16

Maximum DDR4 memory capacity of the node (GB)b

1024

Maximum operating speed (MT/s)

1DPCc

2933d

2DPC

2666

  • a: The maximum number of DDR4 memory modules is based on dual-processor configuration. The value is halved for a server with only one processor.
  • b: The maximum DDR4 memory capacity varies depending on the processor type. The value listed in this table is based on the assumption that memory modules are fully configured.
  • c: DPC (DIMM per channel) indicates the number of DIMMs per channel.
  • d: If the Cascade Lake processor is used, the maximum operating speed of a memory module can reach 2933 MT/s. If the Skylake processor is used, the maximum operating speed of a memory module can reach 2666 MT/s only.
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Updated: 2019-12-25

Document ID: EDOC1000183891

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