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##### DIMM Rank Classification

All DIMMs associated with each CMP must have identical rank classifications.

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 replacement or upgrade DIMMs you intend to install.

The following table identifies the corresponding rank classification label shipped with each DIMM.

Table 22 DIMM Rank Classification Labels

Rank Type | Rank Classifications | Label
--- | --- | ---
Dual-rank x8 DIMMs | 4-Gbyte | 2Rx8
Dual-rank x4 DIMMs | 8-Gbyte | 2Rx4
| 16-Gbyte | 2Rx41
Quad-rank x4 DIMMs | 16-Gbyte | 4Rx4
| 32-Gbyte | 4Rx4*

1Requires System Firmware 8.2.1.b at minimum.

##### Related Information

- Understanding DIMM Configurations

- DIMM Population Rules (Except 1536-Gbyte Configurations)

- Half-Populated Processor Module

- Fully-Populated Processor Module (Except 1536 Gbyte Configurations)

- Increase Memory With Additional DIMMs

- Increase Memory With Additional DIMMs (16-Gbyte Configurations)

- Understanding DIMM Configuration Error Messages

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