OWC 128GB DDR4 2933 ECC Registered RDIMM 8Rx4 CL21 1.2V 288-pin ThinkSystem SR630 SR650 SR850 SR860 SR950

Server memory upgrade

This 128GB DDR4 2933 ECC Registered RDIMM is built for Lenovo ThinkSystem SR630, SR650, SR850, SR860 and SR950 servers running Xeon SP Gen 2 processors. It delivers a single-module capacity increase for workloads that demand high density and error correction. The module operates at 1.2V with CL21 latency and an 8Rx4 rank configuration. Buyers needing unbuffered or load-reduced memory cannot use this product.

288-pin registered form factor

The 288-pin RDIMM fits server and workstation slots that require registered signalling, and the lack of a heat spreader keeps the profile low for dense chassis layouts. ECC registration adds a clock cycle to command addressing, which stabilises large memory arrays but prevents mixing with unbuffered or load-reduced DIMMs. JEDEC and RoHS compliance means the module meets industry electrical and environmental standards for warranty-safe deployment.

DDR4 2933 speed ceiling

Rated at PC4-23400, the module runs at 2933 MT/s and will down-clock to 2666, 2400 or 2133 MT/s when the platform dictates. Bandwidth and latency are bounded by the DDR4 interface and the registered buffer, so applications that scale beyond this generation's throughput will hit a hard limit. Systems requiring higher frequencies or different memory architectures must look elsewhere.