64GB ( 1x 64GB Module ) DDR4 2400 MHz ( PC4-19200 ) DDR4 DIMM ( 288-Pin ) ECC LRDIMM ( Load Reduced DIMM ) 1.2V - DDR4 Standard Voltage Compatible Equivalent for HP Q1V93A, 819413-001, 805358-S21, 805358-K21, 809085-091, 859992-B21, T9V42AA, 805358-B21, 805358-H21, 862934-B21 High performance Memory RAM upgrade designed for Server/Workstation Systems All modules undergo quality assurance testing to ensure dependable and reliable performance Please verify the supported memory (RAM) specifications of your system prior to purchase to ensure compatibility A-Tech provides a Lifetime Warranty for all orders & offers complimentary United States based Tech Support before, during, & after your purchase