Arch Memory 4 GB (1 x 4 GB) 204-Pin DDR3 So-dimm for HP Pavilion Entertainment dm3-1047cl RAM Arch Memory is a Registered Trademark of Arch Computer, LLC 4GB 204-Pin DDR3 1066MHz SODIMMs Compatible with systems that use 204-Pin PC3-8500 SODIMM modules 4GB Memory for HP Pavilion Entertainment Notebook dm3-1047cl By Arch Memory Lifetime Replacement Warranty