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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 on your node.

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

The following memory configuration is available:

  • Independent memory mode

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 solution 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

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

Table 1. Channel and slot information of DIMMs around a processor
CPUCPU 1
ChannelFEDCBAGHIJKL
DIMM slot number123456789101112
CPUCPU 2
ChannelLKJIHGABCDEF
DIMM slot number131415161718192021222324

DRAM DIMM installation order for Independent Mode​

Mixing DIMM capacity, types, and brand are not allowed. All the DIMM installed in the system must be identical.

The following memory configuration is available:

  • Independent memory mode

    • 8 DIMMs per processor, total of 16 DIMMs per node

    • 12 DIMMs per processor, total of 24 DIMMs per node

Independent mode memory population sequence for 8 DIMMs per processor, total of 16 DIMMs per node

Table 2. Independent mode memory population sequence for 8 DIMMs per processor, total of 16 DIMMs per node.
Note
A DIMM slot must be installed with a DIMM or DIMM filler.
ProcessorProcessor 1
DIMM slots123456789101112
8 DIMMs 2 456789 11 
ProcessorProcessor 2
DIMM slots131415161718192021222324
8 DIMMs 14 161718192021 23 

Independent mode memory population sequence for 12 DIMMs per processor, totalof 24 DIMMs per node

Table 3. Independent mode memory population sequence for 12 DIMMs per processor, total of 24 DIMMs per node
ProcessorProcessor 1
DIMM slots123456789101112
12 DIMMs123456789101112
ProcessorProcessor 2
DIMM slots131415161718192021222324
12 DIMMs131415161718192021222324