This is a Kingston Server Premier 64GB DDR5 memory module built specifically for servers, not desktop PCs — it uses ECC (error-correcting code) with registered (buffered) signalling, which lets a server run reliably at high capacities and catches/corrects memory errors on the fly rather than crashing or corrupting data. It runs at DDR5-6400 speed with a CL52 timing latency. Modules like this are bought by IT departments and system integrators to build out or upgrade server and workstation platforms that specifically require registered ECC memory, and must be matched to a motherboard/CPU platform that supports RDIMMs at this speed.