OWC 64GB DDR4 2933MHz ECC Registered RDIMM 2Rx4 288pin Dell PowerEdge R840 R940 R940xa T640 memory upgrade

Server-grade 64GB DDR4 ECC module

This 64GB DDR4 2933MHz ECC Registered RDIMM is built for Dell PowerEdge R840, R940, R940xa and T640 servers. It delivers 64GB capacity at PC4-23400 speed with CL21 latency and 1.2V operation. The 2Rx4 dual-rank organisation suits high-density server configurations. It is not compatible with standard desktop computers or unbuffered memory.

Sustained error-corrected throughput

ECC registered operation corrects single-bit errors and detects multi-bit errors continuously during long compute runs. Registered buffering reduces electrical load on the memory controller, keeping signal integrity stable across fully populated channels. Backward compatibility with 2133MHz, 2400MHz and 2666MHz buses lets the module clock down without data integrity loss when mixed with slower DIMMs.

Bare 288-pin RDIMM for dense chassis

The module has no heat spreader, allowing tight DIMM spacing in 1U and 2U Dell PowerEdge chassis where airflow is directed by system fans. Standard 288-pin RDIMM keying prevents accidental insertion into desktop UDIMM slots. Replacement part numbers AA579530, AA601615, AB003154, SNPW403YC/64G, SNPW403YC/64VXR and W403Y confirm exact mechanical and electrical fit for the listed servers.