Arch Memory 2 GB (1 x 2 GB) 200-Pin DDR2 So-dimm for ASUS UL20A RAM Arch Memory is a Registered Trademark of Arch Computer, LLC 200-Pin DDR2 SODIMM Compatible with systems that use PC2-6400 200-Pin DDR2 SODIMM modules 2GB RAM Memory for ASUS UL20A Notebook by Arch Memory Lifetime Replacement Warranty