Lenovo 4X77A78614, 64 GB, 1 x 64 GB, DDR4, 2666 MHz, 288-pin DIMM Lenovo 4X77A78614. Component for: PC/Server, Internal memory: 64 GB, Memory layout (modules x size): 1 x 64 GB, Internal memory type: DDR4, Memory speed: 2666 MHz, Memory form factor: 288-pin DIMM