Arch Memory 4 GB (1 x 4 GB) 200-Pin DDR2 So-dimm for HP Pavilion Entertainment dv7-3165dx RAM Arch Memory is a Registered Trademark of Arch Computer, LLC 4GB 200-Pin DDR2 800MHz SO-DIMM Compatible with systems that use 200-Pin PC2-6400 SO-DIMM modules 4GB Memory for HP Pavilion Entertainment Notebook dv7-3165dx by Arch Memory Lifetime Replacement Warranty