HP 512MB DDR2-667, 0.5 GB, 1 x 0.5 GB, DDR2, 667 MHz, 240-pin DIMM HP 512MB DDR2-667. Internal memory: 0.5 GB, Memory layout (modules x size): 1 x 0.5 GB, Internal memory type: DDR2, Memory clock speed: 667 MHz, Memory form factor: 240-pin DIMM, ECC