This Kingston 64GB registered DDR5 ECC memory module runs at 5600MT/s with CL46 timings in a dual-rank (2Rx4) configuration, built using SK Hynix 'A' DRAM chips alongside a Renesas-supplied register/PMIC chipset (the supporting components that buffer signals and regulate power on a registered DIMM). It's designed for server and workstation motherboards supporting DDR5 RDIMM memory, where ECC's automatic error detection and correction matters for long-running, mission-critical workloads. As with other registered DIMMs, it reduces load on the host's memory controller, letting more modules be populated at higher total capacity than unbuffered memory allows. Typically bought in matched kits to populate a server's memory channels evenly for maximum bandwidth.