Arch Memory 8 GB (1 x 8 GB) 240-Pin DDR3-1600 PC3-12800 UDIMM RAM Arch Memory is a Registered Trademark of Arch Computer, LLC 1 x 8GB DDR3-1600 PC3-12800 UDIMM 1.5v Dual Rank (2Rx8) Non-ECC Unbuffered 1600MHz Lifetime Replacement Warranty Included