Kingston Technology 4GB DDR4 2133MHz Memory for Select Lenovo, Acer, Dell, HP Desktops (KCP421NS8/4) One 4GB 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 Lenovo Acer and Dell Desktops (Lenovo):03T7465;