OWC 128GB DDR4 2933 PC4-23400 CL21 8Rx4 288-pin 1.2V ECC Registered RDIMM server RAM

Server ECC registered upgrade

This 128GB DDR4 module is built for workstations and servers that require registered ECC memory. It operates at 2933MHz with a CAS latency of 21 and runs at the standard 1.2V. The single 288-pin DIMM uses an 8Rx4 organisation and contains no heat spreader. It will not work in standard desktop computers and must not be mixed with unbuffered or load-reduced modules.

Thermals and power in normal use

Running at 1.2V keeps power draw low for a high-capacity registered DIMM. The bare PCB design relies on chassis airflow rather than a dedicated spreader, so adequate case ventilation is needed to maintain stable temperatures under sustained load. Registered buffering adds minimal latency while reducing electrical load on the memory controller, helping overall system efficiency.

Replaces slower DDR4 or expands capacity

The module is backward compatible with 2133MHz, 2400MHz and 2666MHz systems, allowing it to replace slower DDR4 DIMMs while running at the highest supported speed. It suits administrators extending the life of existing infrastructure or building new servers that need maximum density per slot. Buyers needing unbuffered memory or desktop compatibility should look elsewhere.