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)
Shown below is the specific information about the installation rules and order of memory modules required in ThinkSystem ST650 V3 based on the system configuration and memory mode.
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.
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| 0 | 1 | 0 | 1 | 0 | 1 | 0 | 1 | 1 | 0 | 1 | 0 | 1 | 0 | 1 | 0 | |
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | |
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| 0 | 1 | 0 | 1 | 0 | 1 | 0 | 1 | 1 | 0 | 1 | 0 | 1 | 0 | 1 | 0 | |
| 32 | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | |
Slot No.: DIMM slot number in each memory channel. Each memory channel has two DIMM slots: slot 0 (farthest from the processor) and slot 1 (closest to the processor).
DIMM No.: DIMM slot number on the system board. Each processor has 16 DIMM slots.
Memory module installation guideline
- The following memory configurations and population sequences are supported on ThinkSystem ST650 V3:
DRAM DIMM installation order (RDIMMs or 3DS RDIMMs)
At least one DIMM is required for each processor. Install at least eight DIMMs per processor for good performance.
When a DIMM is replaced, the server provides automatic DIMM enablement capability without requiring you to use the Setup Utility to enable the new DIMM manually.