16GB ( 1x 16GB Module ) DDR4 2133 MHz ( PC4-17000 ) DDR4 DIMM ( 288-Pin ) ECC UDIMM ( ECC Unbuffered DIMM ) 1.2V - DDR4 Standard Voltage Compatible Equivalent for HP N0H88AA, 805671-B21, 805671-S21, 797259-091, 819801-001, M0S34A 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