OWC 512GB (4x128GB) DDR5 4800 CL40 4Rx4 288-pin 1.1V ECC Registered RDIMM memory upgrade

Server memory kit

This OWC kit provides 512GB of DDR5 ECC registered memory in four 128GB modules built for the Lenovo ThinkSystem SR950 V3. It targets administrators who need maximum capacity in a validated server configuration. The modules are JEDEC-standard and RoHS compliant for warranty-safe deployment. They will not work in standard desktop computers or alongside unbuffered or load-reduced DIMMs.

Thermals and power

Each module operates at 1.1V without a heat spreader, relying on the server chassis airflow for cooling. Registered buffering and ECC circuitry add minimal overhead compared with unbuffered equivalents. Power draw scales with the 4800 MT/s data rate and quad-rank density under typical server workloads. Acoustic contribution is determined entirely by the host system fan curves.

Capacity and rank

The kit delivers 512GB total using a 4Rx4 organisation across four 288-pin RDIMMs. This rank structure and density define whether the memory controller can populate all slots at the rated speed. Buyers needing a different rank count or lower total capacity must select another kit.