This is a 64GB DDR5 Registered DIMM (RDIMM) memory module from Kingston, running at 5600MT/s configured as 2Rx4, running at CAS latency CL46. 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 D-die. At 64GB, this dual-rank server module suits mainstream-to-upper server and virtualization configurations needing substantial per-slot capacity on a DDR5-generation platform. The listing's EAN barcode (740617342284) ties this exact SKU to a specific retail-packaged part number for inventory/reordering purposes. As with every component in this category, it is intended for builders and IT resellers who need an exact, verifiable spec sheet before committing to a build or a client quote, not just a brand name.