Lenovo - DDR4 - 4 GB - SO DIMM 260-pin - 2133 MHz / PC4-17000 - 1.2 V - senza buffer - non ECC - per S400z, S500z, ThinkCentre M700 (Tiny) , M700z, M800z, M900 (Tiny) , M900x, M900z, X1, E74