Memory module configuration

Memory performance depends on several variables, such as memory mode, memory speed, memory ranks, memory population and processor.

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

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

Figure 1. Memory module and processor location
Memory module and processor location
Table 1. Memory module and processor location
1 Memory module slot 9–12 4 Memory module slot 1–4
2 Processor socket 2 5 Memory module slot 5–8
3 Processor socket 1 6 Memory module slot 13–16

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

Table 2. Channel and slot information of DIMMs around a processor
Processor Processor 1 Processor 2
Channel B A D C G H E F F E H G C D A B
Memory module slot number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

Memory module installation guideline

  • Mixing x4 and x8 DIMMs in the same channel is allowed.

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