Arch Memory 4 GB (1 x 4 GB) 204-Pin DDR3 So-dimm for HP Pavilion Entertainment dv6-3155dx RAM Arch Memory is a Registered Trademark of Arch Computer, LLC 4GB 204-Pin DDR3 1333MHz SO-DIMM Compatible with systems that use 204-Pin PC3-10600 SO-DIMM modules 4GB Memory for HP Pavilion Entertainment Notebook dv6-3155dx by Arch Memory Lifetime Replacement Warranty