Lenovo 03T6566 4GB PC3-12800U DDR3 1600 Non-ECC Unbuff Desktop Memory Micron Manufacturer: Micron MT8JTF51264AZ-1G6E1 Memory Kit Lenovo Part Number: FRU 03T6566 Memory Type: 240-Pin DDR3 SDRAM Capacity: 4GB Bus Type: PC3-12800U 1600Mhz