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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 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 processor layout

Figure 1. Memory modules and processor layout
Memory module and processor layout

The memory-channel configuration table below shows the relationship between the processor, memory controllers, memory channels, and memory module slot numbers.

Table 1. Channel and slot information of DIMMs around a processor
ChannelChannel 0Channel 1Channel 1Channel 0
DIMM slot number 1234

Memory module installation guideline

  • This server supports Independent mode.

  • This server supports the following type of memory modules:
    • Double-data-rate 4 (TruDDR4) error correcting code (ECC) 3200 MHz registered DIMM (RDIMM)
  • When you replace a DIMM, the server provides automatic DIMM enablement capability without requiring you to use the Setup Utility to enable the new DIMM manually.

  • Do not mix x4 and x8 DIMMs.

  • Install DIMMs of the same speed for optimal performance. Otherwise, the BIOS will find and run the lowest speed among all channels.