Memory module installation rules and order

Memory modules must be installed in a specific order based on the memory configuration that you implement and the number of processors and memory modules installed in the server.

Note

List of supported memory module is different for 1st generation (Skylake) and 2nd generation (Cascade Lake) Intel Xeon processors. Make sure to install compatible memory modules to avoid system error. For a list of supported DIMMs, see: Lenovo ServerProven website.

The following memory configurations and population sequences are supported for the ThinkSystem SR850 server:

Independent memory mode
- Installation order: independent memory mode with two processors
- Installation order: independent memory mode with four processors
Memory mirroring mode
- Installation order: memory mirroring with two processors
- Installation order: memory mirroring with four processors
Memory sparing mode
- Installation order: memory sparing with two processors
- Installation order: memory sparing with four processors

The following memory configurations and population sequences are supported with DC Persistent Memory Modules (DCPMMs).

App Direct Mode
- Installation order: App Direct Mode with two processors
- Installation order: App Direct Mode with four processors
Memory Mode
- Installation order: Memory Mode with two processors
- Installation order: Memory Mode with four processors
Mixed Memory Mode
- Installation order: Mixed Memory Mode with two processors
- Installation order: Mixed Memory Mode with four processors

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