Nanya NT1GT64U88D0BY-3C 4GB 4 x 1GB PC2-5300U DDR2 667 Non-ECC Unbuff Memory Kit Manufacturer: Nanya NT1GT64U88D0BY-3C Memory Type: DDR2 SDRAM Capacity: 4GB 4 x 1GB Memory Bus Type: PC2-5300U Data Transfer Rate: 667Mhz