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FusionServer Pro XH628 V5 Server Node V100R005 Maintenance and Service Guide 03

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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.
    NOTE:

    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.
    NOTE:

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

Table 11-5 DDR4 memory specifications

Parameter

Specifications

Rated speed (MT/s)

2933a

Operating voltage (V)

1.2

Maximum number of DDR4 memory modules in a node

16b

Maximum capacity per DDR4 memory module (GB)

64

Maximum DDR4 memory capacity of the node (GB)

1024c

Maximum operating speed (MT/s)

One DDR4 memory module per channel

2933a

Two DDR4 memory modules per channel

2666

  • a: If the Cascade Lake processor is used, the rated speed and maximum operating speed of the RDIMM can reach 2933 MT/s. If the Skylake processor is used, the rated speed and maximum operating speed of a DDR4 memory module can reach 2666 MT/s only.
  • b: The maximum number of DDR4 memory modules is based on dual-processor configuration.
  • c: The maximum DDR4 memory capacity varies depending on the processor type. The value listed in this table is based on the assumption that sixteen 64 GB DDR4 memory modules are configured.
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Updated: 2019-08-12

Document ID: EDOC1100036739

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