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XH321L V5 Server Node V100R005 Maintenance and Service Guide 02

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DIMM Ranks

DIMM Ranks

To understand and configure memory protection modes properly, it is helpful to learn about single-rank, dual-rank, and quad-rank DIMMs. Some DIMM configuration requirements are based on these classifications.

  • A single-rank DIMM has one set of memory chips that is accessed while data is written to or read from the memory.
  • A dual-rank DIMM has two single-rank DIMMs on the same module, with only one rank accessible at a time.
  • A quad-rank DIMM has two dual-rank DIMMs on the same module, with only one rank accessible at a time.

The server memory control subsystem selects a proper rank within the DIMM when data is written to or read from the DIMM.

Dual- and quad-rank DIMMs provide the greatest capacity with the existing memory technology. For example, if the current DRAM technology supports 8 GB single-rank DIMMs, a dual-rank DIMM can offer a capacity of 16 GB and a quad-rank DIMM can offer a capacity of 32 GB.

LRDIMMs are labeled as quad-rank DIMMs. There are four ranks of DRAM on the DIMM, but the LRDIMM buffer creates an abstraction that allows the DIMM to appear as a logical dual-rank DIMM to the system. The LRDIMM buffer also isolates the electrical loading of the DRAM from the system to allow for faster operation. These two changes provide a higher memory operating speed compared with quad-rank RDIMMs.

Updated: 2019-01-08

Document ID: EDOC1100033003

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