MODULES MUST BE ORDERED AND INSTALLED IN IDENTICAL GROUPS OF EIGHT FOR MAXIMUM MEMORY PERFORMANCE.
Per Intel, mixing module types (x4 and x8) is NOT allowed within a bank group or channel.
Mixing ranks is permitted within a channel if they are the same module type (2Rx4 + 1Rx4 / 2Rx8 + 1Rx8). 2R (Dual Rank) DIMMs must always be populated in the first memory bank if combined with 1R (Single Rank) DIMMs installed in the second memory bank.
Per Intel, 5600MT/s is supported in 1DPC (1 DIMM per channel) configuration with select 5th Gen Intel Xeon processor models, while mid- and low-tier models may limit memory speed to 5200MT/s or 4400MT/s. 4th Gen Intel Xeon models support up to 4800MT/s with select Platinum and Gold models. Check with Intel for supported memory speeds by processor model.
In 2DPC (2 DIMMs per channel), or 16 DIMMs per processor, the maximum memory speed supported by both 4th and 5th Gen Xeons is 4400MT/s.
All 5600MT/s and 4800MT/s memory will safely clock down to slower speeds when forced by the chipset/processor.
A 5th Gen Xeon processor may be required to use 96GB RDIMMs. These cannot be mixed with any other capacities or module types.
Refer to manual for supported memory configurations and speeds.