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##### DIMM Rank Classification Labels

All DIMMs installed in the server must be identical (same capacity, same rank classification).

Each DIMM includes a printed label identifying its rank classification (examples below). Use these rank classification labels to identify the architecture of the DIMMs installed in the server, as well as any replacment or upgrade DIMMs you intend to install.

Tip - To determine the rank classification of installed DIMMs, remove the server top cover and read the labels on the DIMMs. For top cover removal instructions, see Preparing for Service.

The following table identifies the corresponding rank classification labels on supported DIMMs.

Table 28 DIMM Rank Classifications

Rank Type | Capacity | Label
--- | --- | ---
Dual-rank x8 DIMMs | 4 GByte | 2Rx8
Dual-rank x4 DIMMs | 8 GByte | 2Rx4
| 16 GByte1 | 2Rx4
Quad-rank x4 DIMMs | 16 GByte | 4Rx4
| 32 GByte* | 4Rx4

1Requires System Firmware 8.2.1.b or later.

Note - DIMMs installed must have identical architecture. For more information, see DIMM Population Rules.

##### Related Information

- DIMM Population Rules

- DIMM FRU Names

- Supported DIMM Configurations

- Increase System Memory With Additional DIMMs

- Verify DIMM Functionality

- DIMM Configuration Error Messages

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