OWC 128GB DDR5 4800 CL40 4Rx4 288-pin 1.1V ECC Registered RDIMM

Server ECC DDR5 upgrade

This 128GB DDR5 registered DIMM is built for HP ProLiant DL320 Gen11, DL380a Gen11 and DX320 Gen11 servers. It delivers error-correcting memory for workloads that cannot tolerate data corruption. The module is not compatible with standard desktop computers or consumer motherboards. Buyers who need unbuffered or load-reduced memory for other platforms must choose a different product.

DDR5 4800 registered limits

The stick runs at DDR5 4800 with CL40 latency and 1.1V operation under JEDEC PC5-38400 specification. Registered buffering adds one cycle of address-command delay, which is mandatory for the supported ProLiant platforms. Mixing this module with unbuffered or load-reduced DIMMs will prevent the system from booting. Capacity beyond 128GB per slot requires higher-density parts not covered by this part number.

Single-rank 4Rx4 build

A 4Rx4 organisation packs the full 128GB into one 288-pin module without a heat spreader, leaving the DRAM exposed for direct airflow in dense server chassis. The registered interface and ECC function are handled by the onboard register and parity logic, so no extra cables or configuration steps are needed. Installers simply seat the DIMM in a compatible slot and the firmware recognises it automatically.