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:
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
The memory-channel configuration table below shows the relationship between the processors, memory controllers, memory channels, and memory module slot numbers.
| Channel number | Channel A | Channel B | Channel D | Channel E | Channel F | Channel H |
| DIMM slot number | 3 | 2 | 1 | 4 | 5 | 6 |
Memory module installation guideline
ThinkEdge SE455 V3 supports Independent memory mode installation order.
Consider corresponding rules and population sequence accordingly:
A label on each DIMM identifies the DIMM type. This information is in the format xxxxx nRxxx PC4-xxxxx-xx-xx-xxx. Where n indicates if the DIMM is single-rank (n=1) or dual-rank (n=2).
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.
Mixing single-rank and dual-rank DIMMs is allowed.
Install DIMMs of the same speed for optimal performance. Otherwise, the BIOS will find and run the lowest speed among all channels.