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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.

Supported memory types

For information on the types of memory module supported by this server, see Memory section in Technical Specifications.

Information about optimizing memory performance and configuring memory is available at the Lenovo Press website:

Memory - Lenovo Press

In addition, you can take advantage of a memory configurator, which is available at the following site:

Lenovo Enterprise Solutions Configurator (Memory Configurations)

Specific information about the required installation order of memory modules in your server based on the system configuration and memory mode that you are implementing is shown below.

Memory modules and processors layout​

Figure 1. Memory modules and processors layout
Memory module and processor location
Table 1. Memory slot and channel identification
ChannelChannel AChannel B
CHA2CHA1CHB2CHB1
Slot number4321

Supported type of memory modules​

This server supports the following type of memory modules:

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

  • TruDDR5 4800 MHz 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.

For best performance, make sure all memory modules have the same memory capacity, speed, and vendor.
Note
When single-rank (1R) and dual-rank (2R) memory modules are mixed in the same system, the memory speed is 2000 MHz.
The following table shows the memory module installation order:
Table 2. Memory module installation sequence
Total memory module installedMemory module slot numberMemory speed
4321
One √  
  • 1R: 4400 MHz
  • 2R: 4400 MHz
Two √ √
Three√√ √
  • 1R: 4000 MHz
  • 2R: 3600 MHz
Four√√√√