HP PC2-5300 4GB, 4 GB, 1 x 4 GB, DDR2, 667 MHz, 240-pin DIMM HP PC2-5300 4GB. Component for: PC/server, Internal memory: 4 GB, Memory layout (modules x size): 1 x 4 GB, Internal memory type: DDR2, Memory clock speed: 667 MHz, Memory form factor: 240-pin DIMM, ECC