NEMIX RAM 128GB DDR5 4800 CL40 4Rx4 ECC RDIMM HPE P63345-B21 memory upgrade

HPE DDR5 4800 ECC RDIMM Server Memory

This 128GB registered DDR5 module operates at 4800MHz with CL40 latency and 1.1V voltage. It uses a 4Rx4 rank configuration and 288-pin form factor for HPE server compatibility. The ECC registered design targets data integrity in enterprise workloads.

DDR5 4800 Interface Practical Limits

DDR5 4800 delivers 38400 MB/s peak bandwidth per module. Registered buffering adds one clock cycle of latency versus unbuffered memory. The 1.1V operating voltage reduces power draw compared to earlier DDR generations. Mixed-speed populations will downclock to the slowest installed module.

128GB 4Rx4 Capacity Constraint

A single 128GB 4Rx4 module occupies one DIMM slot but presents four logical ranks to the memory controller. Platforms limited to eight ranks per channel can only populate two such modules per channel. Systems requiring higher densities per slot or lower rank counts for maximum channel population should evaluate alternative configurations.