Fujitsu Memory 512MB 400MHz DDR SDRAM DIMM, 0.5 GB, DDR, 400 MHz, 184-pin DIMM Fujitsu Memory 512MB 400MHz DDR SDRAM DIMM. Internal memory: 0.5 GB, Internal memory type: DDR, Memory clock speed: 400 MHz, Memory form factor: 184-pin DIMM