HP 8GB DDR3-1600, 8 GB, 2 x 4 GB, DDR3, 1600 MHz, 240-pin DIMM HP 8GB DDR3-1600. Internal memory: 8 GB, Memory layout (modules x size): 2 x 4 GB, Internal memory type: DDR3, Memory clock speed: 1600 MHz, Memory form factor: 240-pin DIMM