Arch Memory 4 GB (1 x 4 GB) 204-Pin DDR3 So-dimm RAM for Acer Aspire 5253 AS5253-BZ602 Arch Memory is a Registered Trademark of Arch Computer, LLC 1 x 4GB DDR3-1066 PC3-8500 204-Pin Sodimm 1.5v Dual Rank (2Rx8) 1066MHz Lifetime Replacement Warranty Included