Ramaxel RMR5040ED58E9W-1600 4GB PC3-12800U DDR3 1600 Non-ECC Unbuff Memory Kit Brand: Ramaxel RMR5040ED58E9W-1600 Type: 240-Pin DDR3 SDRAM Capacity: 4GB Memory Speed: DDR3 1600 (PC3 12800) Non-ECC Unbuffered