HP 487566-001, 4 GB, 1 x 4 GB, DDR2, 800 MHz, 240-pin DIMM HP 487566-001. Component for: PC/Server, Internal memory: 4 GB, Memory layout (modules x size): 1 x 4 GB, Internal memory type: DDR2, Memory clock speed: 800 MHz, Memory form factor: 240-pin DIMM, ECC