DELL AB128227, 16 GB, 2 x 8 GB, DDR4, 2666 MHz, 288-pin DIMM DELL AB128227. Internal memory: 16 GB, Memory layout (modules x size): 2 x 8 GB, Internal memory type: DDR4, Memory clock speed: 2666 MHz, Memory form factor: 288-pin DIMM, ECC