Arch Memory 1 GB (1 x 1 GB) 200-Pin DDR2 So-dimm for Toshiba Satellite A135-S4527 RAM Arch Memory is a Registered Trademark of Arch Computer, LLC 1 x 1GB DDR2-533 PC2-4200 200Pin Sodimm CL4 Single Rank (1Rx8) 533MHz Lifetime Replacement Warranty Included