OWC 128GB DDR4 2933 ECC Registered RDIMM 288-pin 1.2V CL21 8Rx4 memory upgrade

128GB DDR4 ECC Registered RDIMM

This 128GB DDR4 2933 module is built for Dell PowerEdge C4140, FC640, M640, MX740c and R640 servers. It delivers registered ECC memory for workloads that require error correction and signal buffering in multi-socket configurations. The single DIMM uses an 8Rx4 organisation at 1.2V and conforms to JEDEC PC4-23400 timing with CL21 latency. It is intended for administrators extending the service life of existing rack or blade infrastructure.

Compatibility check before ordering

Verify that your system accepts 288-pin DDR4 ECC Registered RDIMMs and that the memory controller supports 8Rx4 rank density at 2933 MT/s. The module will not work in platforms that require unbuffered or load-reduced DIMMs, nor in standard desktop boards. Confirm the server BIOS revision allows mixing with any installed modules running at 2133, 2400 or 2666 MT/s, as the DIMM is backward compatible with those speeds. No heat spreader is fitted, so ensure airflow meets the chassis thermal design.

Sustained-load behaviour

Registered signalling reduces electrical load on the memory bus, helping maintain stability when all channels are populated at high capacity. ECC corrects single-bit errors on the fly, preventing silent data corruption during long compute runs or virtualisation workloads. The 1.2V operating voltage keeps power draw predictable across extended duty cycles. CL21 timing at 2933 MT/s provides consistent latency without relying on short-burst boost profiles.