Arch Memory 4 GB (1 x 4 GB) 204-Pin DDR3 So-dimm RAM for Lenovo IdeaPad Y460, Y550, Y560 and Z560 RAM Arch Memory is a Registered Trademark of Arch Computer, LLC 1 x 4GB DDR3-1333 PC3-10600 204-Pin Sodimm 1.5v Dual Rank (2Rx8) 1333MHz Lifetime Replacement Warranty Included