Kingston Technology 4GB (1x4 GB) 1600MHz DDR3 PC3 12800 240-Pin ECC DIMM Memory for HP/Compaq KTH-PL316E/4G One 4GB Module of 1600MHZ DDR3 ECC Memory for HP/Compaq Servers and Workstations A2Z48AA (HP/Compaq); QE257AV (4x4GB) (HP/Compaq) Backed by a lifetime warranty and free technical support From the industry leader in PC memory Designed and tested for compatibility in various HP/Compaq servers and workstations