Hynix 4GB 4 x 1GB PC2-5300U DDR2 667 Non-ECC Unbuff Memory Kit HYMP512U64CP8-Y5 Manufacturer: Hynix HYMP512U64CP8-Y5 AB-C Memory Memory Type: DDR2 SDRAM Capacity: 4GB 4 x 1GB Bus Type: PC2-5300 667 Mhz Error Correction: Non-ECC