Kingston Technology 8GB DDR4-2133MHz ECC, CL15, X8, 1.2V, Unbuffered, DIMM Desktop Memory (KTH-PL421E/8G) One 8GB Module of 2133MHZ DDR4 Memory 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 Desktops (HP/Compaq):805669-B21,T0E51AA;