RDIMM and CMM installation order

Memory installation guidelines​

• CMMs are only supported in server configurations with four processors.

• CMM channel: number of devices per root port, with root ports separated by +, e.g. 2+2+2+2 = four root ports populated with two devices per root port

• CMM modes:

  • 1LM+Vol = Native DDR5 (1LM) and (volatile) CMM visible to software (SW) as separate tiers, separately interleaved

  • Hetero x12 = DDR5 and (volatile) CMM interleaved together in one 12-way set

    Note

    The Hetero mode is not supported with LCC processors. For specific models of LCC processors, see the Processors section in SR860 V4 Product Guide.

• To set the CMM mode, go to UEFI Setup > System Settings > Memory > CXL Memory Module > Memory Mode.