HPE 64GB PC4-19200 DDR4-2400MHz Registered ECC CL17 288-Pin Load Reduced DIMM 1.2V Quad Rank Memory Module. The HPE 805358-K21 is a high-performance 64GB DDR4 memory module, designed for demanding server environments. With a speed of 2400MHz (PC4-19200), this Registered ECC module ensures data integrity and reliability. Featuring CL17 latency, a 1.2V power requirement, and a 288-pin Load Reduced DIMM (LRDIMM) form factor, it offers efficient and stable performance. Its quad rank design further enhances its capacity and efficiency, making it an ideal choice for enterprise-grade applications.