Fujitsu 512MB DDR2 SDRAM Memory Module, 0.5 GB, DDR2, 400 MHz, 200-pin SO-DIMM Fujitsu 512MB DDR2 SDRAM Memory Module. Internal memory: 0.5 GB, Internal memory type: DDR2, Memory clock speed: 400 MHz, Memory form factor: 200-pin SO-DIMM