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. It's designed for server and workstation motherboards supporting DDR5 RDIMM memory, where ECC automatically detects and corrects single-bit errors — important for long-running server, database, and virtualization workloads. The registered (buffered) design reduces electrical load on the host memory controller, letting more DIMMs be populated per channel at higher total capacity than unbuffered consumer memory allows. This part number appears to be a close sibling of Kingston's Hynix-A-with-Renesas-register variant also in this catalog, likely differing only in the supporting register/PMIC chipset used.