Arch Memory 2 GB (1 x 2 GB) 240-Pin DDR2 UDIMM for HP Pavilion Media Center a1624n RAM Arch Memory is a Registered Trademark of Arch Computer, LLC 2GB 240-Pin DDR2 667Mhz SDRAM Compatible with systems that use 240Pin PC-6400 SDRAM modules 2 GB Memory for HP Pavilion Media Center a1624n By Arch Memory Lifetime Warranty