Samsung M378B5173CB0-CK0 8GB 2 x 4GB PC3-12800U DDR3 1600 Mhz Desktop Memory Kit Manufacturer: Samsung Desktop Memory Kit Part Number: M378B5173CB0-CK0 Memory Type: 240-Pin DDR3 SDRAM Capacity: 8GB 2 x 4GB Bus Type: PC3-12800U 1600Mhz