OWC 16GB DDR4 2933MHz CL21 ECC Registered RDIMM memory upgrade for Lenovo ThinkSystem SR650 SR950

Server-Specific DDR4 ECC RDIMM

This 16GB DDR4 2933MHz CL21 registered module is built for Lenovo ThinkSystem SR650 and SR950 servers running Xeon SP Gen 2 processors. It delivers ECC error correction and registered signalling for data integrity in multi-socket workloads. The 1.2V 288-pin RDIMM is not compatible with standard desktop motherboards or unbuffered memory configurations. Buyers who need consumer DIMMs or laptop SO-DIMMs should look elsewhere.

Sustained Load Stability

ECC registered architecture corrects single-bit errors and detects multi-bit errors during continuous operation, reducing silent data corruption in database and virtualisation tasks. The module operates at DDR4 2933 (PC4-23400) with CL21 latency and maintains JEDEC-compliant 1.2V voltage under full population. Backward compatibility with 2133MHz, 2400MHz and 2666MHz buses allows mixed-speed deployments without downclocking the entire channel. Systems requiring higher capacities per slot or non-ECC memory will not be served by this part.

Lenovo Part Replacement

This OWC module replaces Lenovo part numbers 01AG631, 4ZC7A08708 and 4ZC7A08741, offering a direct upgrade path for ThinkSystem SR650 and SR950 platforms. The 2Rx8 rank organisation fits existing memory configurations without requiring BIOS changes. The jump is worthwhile when expanding memory capacity for virtualisation density or extending the service life of deployed infrastructure. Buyers needing larger single-module capacities or different rank structures must verify platform limits before ordering.