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##### DIMM Population Rules

Keep the following guidelines in mind when installing, upgrading, or replacing DIMMs:

- Up to 16 DDR3 DIMMs can be installed on the server.

- Four DIMM capacities are supported: 4 GBytes, 8 GBytes, 16 GBytes, and 32 GBytes.

- All DIMMs installed in the server must have identical architecture, including identical capacity and rank classification. To identify DIMM architecture, see DIMM Rank Classification Labels.

  Note - 2Rx4 16 GByte DIMMs and all 32 GByte DIMMs require System Firmware 8.2.1.b or later. See DIMM Rank Classification Labels.

- The DIMM slots may be populated as 1/4 full, 1/2 full, or full. Use the following figure as a guide for populating the DIMM slots.

  - 1/4 Full—Install DIMMs in the slots labeled 1 only.

  - 1/2 Full—Install DIMMs in the slots labeled 1 and 2 only.

  - Full—Install DIMMs in every slot (1, 2, and 3).

- Any DIMM slot that does not have a DIMM installed must have a DIMM filler.

Note - The server must have at least a 1/4-full memory configuration.

If the server's memory configuration fails to meet any of these rules, applicable error messages are reported. See DIMM Configuration Errors—System Console for a description of these messages.

##### Related Information

- DIMM FRU Names

- Supported DIMM Configurations

- DIMM Rank Classification Labels

- Increase System Memory With Additional DIMMs

- Verify DIMM Functionality

- DIMM Configuration Error Messages

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