This 128GB DDR5 Registered DIMM (RDIMM) from Kingston, running at 6400MT/s configured as 2Rx4, running at CAS latency CL52. As a Registered DIMM (RDIMM), it is a server-class module — the on-module register buffers the command/address signal, which reduces electrical load and lets a server motherboard reliably support many densely-populated DIMM slots, but it requires a server/workstation platform whose memory controller specifically supports registered memory, and will not work in a typical desktop board. Matching capacity, speed, and form factor exactly to the target system (and, for a multi-module upgrade, matching modules to each other) is what lets DDR5 memory run reliably at its full rated speed rather than falling back to a slower, auto-negotiated speed or failing to POST altogether. It ships with ECC protection with the register that defines RDIMM memory. The module uses Micron B-die. At 128GB, this is a genuinely large-capacity server module, aimed at densely-populated multi-channel server platforms running memory-hungry workloads like virtualization hosts, large in-memory databases, or big application servers. The listing's EAN barcode (740617346787) ties this exact SKU to a specific retail-packaged part number for inventory/reordering purposes. It ships with the standard manufacturer warranty and is aimed at builders, upgraders, and IT professionals in South Africa who need accurate specifications to match against their existing platform.