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 Computing Product 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 CPU
    • M processors: 1.5 TB/socket
    • Other processors: 768 GB/socket
  • Cascade Lake CPU
    • 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 Computing Product 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.