HP 13L78AT, 4 GB, 1 x 4 GB, DDR4, 3200 MHz, 260-pin SO-DIMM HP 13L78AT. Component for: PC, Internal memory: 4 GB, Memory layout (modules x size): 1 x 4 GB, Internal memory type: DDR4, Memory clock speed: 3200 MHz, Memory form factor: 260-pin SO-DIMM