NEMIX RAM MR38400-744K2 256GB (2x128GB) DDR5 4800 CL40 ECC RDIMM memory upgrade

Dell PowerEdge XE8640 memory kit

This 256GB kit contains two 128GB DDR5 4800 CL40 ECC RDIMM modules built for the Dell PowerEdge XE8640 rack server. Registered buffering and on-die ECC protect data integrity in mission-critical workloads. The kit targets IT teams upgrading memory capacity in validated Dell server configurations. Buyers needing non-ECC or unbuffered DIMMs for desktop platforms cannot use this product.

Registered DDR5 at 1.10 V

Each module operates at the standard DDR5 server voltage of 1.10 V with a CAS latency of CL40. Registered signalling reduces electrical load on the memory controller, helping thermal headroom in dense chassis. No heat spreaders are fitted, so airflow across the 288-pin DIMMs must be provided by the server cooling design. Systems requiring lower latency or active cooling on the modules themselves are not addressed by this kit.

Two-module validated kit

The package supplies a matched pair of 128GB 4Rx4 RDIMMs tested for compatibility with the Dell PowerEdge XE8640. No additional software, cables or mounting hardware are included. Installation follows the server manufacturer memory population rules. Environments that require single-module upgrades, mixed-capacity populations or third-party qualification reports are not covered by this bundle.