Fujitsu PRIMERGY RX2530 M4

RX2530 M4 Upgrade and Maintenance Manual 279
Main memory
Dual-rank / quad-rank / octal-rank DIMMs
– Same letter represents identical DIMMs (capacity, rank).
– In Rank Sparing mode only one DIMM capacity per CPU is allowed.
– "x" must always be DIMM with more ranks than "z".
– If both DIMMs have same number of ranks, "x" represents DIMM with higher
capacity.