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Memory module installation rules and order

Memory modules must be installed in a specific order based on the memory configuration of the server.

Numbers and the location of memory module slots​

This server comes with four memory module slots. The following illustration shows the location of the memory module slots on the system board:

Figure 1. Memory module slots location
Memory module slots location
1 Memory module slots

For a list of supported memory module options, see: Lenovo ServerProven website.

Supported type of memory modules​

This server supports the following type of memory modules:

  • TruDDR5 4800MHz ECC UDIMM: 16 GB (1Rx8)

  • TruDDR5 4800MHz ECC UDIMM: 32 GB (2Rx8)

Memory mode and installation order​

Independent mode

Independent mode provides high performance memory capability. You can populate all channels with no matching requirements. Individual channels can run at different memory module timings, but all channels must run at the same interface frequency.

Note

  • All memory modules to be installed must be the same type.

  • All memory modules to be installed must be the same capacity.

  • For best performance, make sure all memory modules have the same memory capacity, speed, and vendor.

  • Mixing single rank (1R) and dual-rank (2R) memory modules in the same memory channel or across memory channels are not allowed.

The following table shows the memory module installation order:
Table 1. Memory module installation sequence
Total memory module installedMemory module slot numberMemory speed
1234
One  √ 
  • 1R: 4400MHz
  • 2R: 4400MHz
Two√ √ 
Three√ √√
  • 1R: 4000MHz
  • 2R: 3600MHz
Four√√√√