MODULES MUST BE ORDERED AND INSTALLED IN IDENTICAL GROUPS OF TWELVE FOR MAXIMUM MEMORY PERFORMANCE.
Mixing module types and densities (x4, x8, 16Gbit, 24Gbit) is NOT allowed. All modules must be identical.
Per AMD, 4800MT/s is supported in 1DPC (1 DIMM per channel) configuration with 4th Gen EPYC processor models. In 2DPC (2 DIMMs per channel) memory will clock down to 4400MT/s with 1R (Single Rank) DIMMs installed, and 4000MT/s with 2R (Dual Rank) DIMMs installed.
5600MT/s will automatically clock down to run at 4800MT/s.
Refer to manual for supported memory configurations and speeds.