Supermicro - UP SuperServer SYS-521C-NR (Super X13SEDW-F)

SYS-521C-NR

MODULES MUST BE ORDERED AND INSTALLED IN IDENTICAL GROUPS OF EIGHT FOR MAXIMUM MEMORY PERFORMANCE.
Mixing x4 and x8 type modules is allowed within the same channel (example: DIMM A0 + A1), however not within the same bank group (example: DIMM A0 + B0).
When 1R (Single Rank) and 2R (Dual Rank) RDIMMs are populated in 2DPC (Two DIMMs per Channel), always populate the 2R DIMM first, generally starting from the farthest socket from the processor, refer to installation manual (example: 2R in DIMM A0, 1R in DIMM A1).

Per Intel, only select Xeon Platinum 8400 series and Gold 6400 series processors support 4800MT/s DDR5. Mid- and lower-tier processor models will clock memory speeds down. Kingston memory will clock down to run at optimal speed depending on processor model and number/type of modules installed.
Per Intel, 4800MT/s DDR5 is supported in 1DPC (One DIMM per Channel) per processor, and will clock down to 4400MT/s in 2DPC (Two DIMMs per Channel). Some processor models will limit speed to 4000MT/s.