Samsung M378T2953EZ3-CE6 4GB 4 x 1GB PC2-5300U DDR2 667 NonECC Unbuff Memory Kit Manufacturer: Samsung M378T2953EZ3-CE6 Memory Type: 240 Pin DDR2 SDRAM Memory Capacity: 4GB 4 x 1GB Bus Type: PC2-5300U Data Transfer Rate: 667Mhz