Arch Memory 2 GB (1 x 2 GB) 240-Pin DDR2 UDIMM for Lenovo ThinkCentre A57 9702, 9703, 9704, 9708 Series RAM Arch Memory is a Registered Trademark of Arch Computer, LLC Pins: 240 Pin Data Transfer Rate: 800Mhz System Type: Desktops Bus Type: PC-6400