Hynix HYMP125U64CP8-S6 4GB 2 x 2GB PC2-6400U DDR2 800 Non-ECC Unbuff Memory Kit Manufacturer: Hynix HYMP125U64CP8-S6 Memory Type: 240 Pin DDR2 SDRAM Capacity: 4GB 2 x 2GB Memory Bus Type: PC2-6400 Data Transfer Rate: 800Mhz