OWC 128GB DDR4 2933MHz CL21 ECC Registered RDIMM 2R9D44R4128G

128GB DDR4 ECC Registered RDIMM for Lenovo

This 128GB DDR4 2933MHz CL21 module is built for Lenovo ThinkAgile VX servers running second-generation Xeon Scalable processors. It targets administrators who need high-capacity, error-correcting memory to support virtualisation workloads or large datasets in the listed VX3320, VX3520-G, VX5520, VX7320-N and VX7520 platforms.

Compatibility and configuration checks before

Verify that the target server currently uses registered ECC DDR4 RDIMMs, because this module will not work in systems that require unbuffered memory. Confirm the motherboard has a free 288-pin DDR4 slot and that the existing memory population rules allow a 4Rx4 rank configuration. The stick operates at 1.2V and is backward compatible with 2133MHz, 2400MHz and 2666MHz bus speeds if the platform requires a lower frequency.

Integration into a server build

The registered design places a buffer on the command bus, reducing electrical load on the memory controller and allowing the platform to populate more slots per channel. ECC circuitry detects and corrects single-bit errors, protecting data integrity in always-on environments. With no heat spreader fitted, the module relies on the server’s directed airflow for cooling, leaving adjacent DIMM slots unobstructed for further capacity expansion.