DIMMs come in a variety of ranks: single, dual, or quad. Each DIMM is shipped with a label identifying its rank classification. The following table identifies the corresponding rank classification label shipped with each DIMM.
Table 20 DIMM Rank Classification Labels
Note - While the Sun Server X3-2L does support single-rank DIMMs, that is, single-rank DIMMs can be installed in the server, Oracle does not offer any single-ranks for purchase, either as factory-installed options or as separately orderable options.