HP 1GB PC2-6400s, 1 GB, 1 x 1 GB, DDR2, 800 MHz, 200-pin SO-DIMM HP 1GB PC2-6400s. Component for: Laptop, Internal memory: 1 GB, Memory layout (modules x size): 1 x 1 GB, Internal memory type: DDR2, Memory clock speed: 800 MHz, Memory form factor: 200-pin SO-DIMM