Kingston 8GB 1866MHz Reg ECC Memory for Select HP/Compaq Desktops KTH-PL318/8G One 8GB Module of 1866MHZ DDR3 Memory Backed by a lifetime warranty and free technical support From the industry leader in PC memory Compatible with (HP/Compaq):708639-B21 (2R),731761-B21,E2Q94AA;