16GB ( 1x 16GB Module ) DDR4 2400 MHz ( PC4-19200 ) DDR4 DIMM ( 288-Pin ) ECC RDIMM ( Registered DIMM ) 1.2V - DDR4 Standard Voltage Compatible Equivalent for HP 836220-S21, 809081-081, 862928-B21, 836220-B21, 836221-B21, 836221-S21, P02972-001, P0002744-001, 846740-001 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