OWC 256GB (4x64GB) DDR5 4800 CL40 2Rx4 288-pin 1.1V ECC Registered RDIMM Kit for ThinkSystem SR950 V3

Server ECC DDR5 Kit

This OWC kit delivers 256GB of DDR5 ECC registered memory across four 64GB modules. It is built for the Lenovo ThinkSystem SR950 V3 server platform. The modules provide error-correcting code and registered buffering for data integrity in multi-socket workloads. They will not function in standard desktop computers or with unbuffered memory types.

JEDEC Registered Build

Each module uses a 288-pin RDIMM form factor without a heat spreader, running at the JEDEC-standard 1.1V. The registered design reduces electrical load on the server memory controller for stable operation at scale. Compatibility is validated specifically for the SR950 V3, so mixing with load-reduced or unbuffered DIMMs is not supported. This kit offers a warranty-safe upgrade path for existing infrastructure.

4800 CL40 Speed Rating

The modules operate at DDR5 4800 (PC5-38400) with a CAS latency of CL40 in a 2Rx4 rank configuration. This speed grade matches the platform specification for the target server. Buyers needing higher frequencies or lower latencies must verify platform support before purchasing. The single rated speed determines whether this kit fits the required performance envelope.