HyperX KHX8500D2K2/4G, 4 GB, 2 x 2 GB, DDR2, 1066 MHz, 240-pin DIMM HyperX KHX8500D2K2/4G. Internal memory: 4 GB, Memory layout (modules x size): 2 x 2 GB, Internal memory type: DDR2, Memory clock speed: 1066 MHz, Memory form factor: 240-pin DIMM