ADATA 1GB, DDR2, 667Mhz, PC5400, 1 GB, DDR2, 667 MHz, 240-pin DIMM ADATA 1GB, DDR2, 667Mhz, PC5400. Internal memory: 1 GB, Internal memory type: DDR2, Memory clock speed: 667 MHz, Memory form factor: 240-pin DIMM