This is a Kingston Server Premier 64GB DDR5 ECC Registered memory module for servers, running at the slightly lower DDR5-5600 speed with CL46 timing (the sibling module in this catalog runs at 6400MT/s CL52). Registered ECC memory is used specifically because it can be error-corrected on the fly and buffered for stability at high capacities across many DIMM slots, which desktop-grade unbuffered memory cannot do reliably. Bought by IT departments and system integrators building or upgrading server platforms, and must be matched to a motherboard/CPU platform that supports RDIMMs at this speed — buyers should confirm their platform's supported memory speed before ordering.