Arch Memory 16 GB (2 x 8 GB) 204-Pin DDR3 So-dimm for Lenovo ThinkPad E540 20C60058US RAM Arch Memory is a Registered Trademark of Arch Computer, LLC 2 x 8GB DDR3-1600 PC3-12800 204-Pin Sodimm 1.5v Dual Rank (2Rx8) 1600MHz Lifetime Replacement Warranty Included