Lenovo ThinkPad Laptop Computer T420s 14" Intel Core i5 2nd Generation Wi-Fi NO RAM NO Hard drive NO Operating System
16GB KIT (2 x 8GB) for IBM Lenovo ThinkPad T Series T420 T420i T420s T520 T520i. SO-DIMM DDR3 Non-ECC PC3-10600 1333MHz RAM Memory. Genuine A-Tech Brand. at Amazon.com
Arch Memory 4GB 204-Pin DDR3 1333 MHz So-dimm RAM for Lenovo ThinkPad T420 4177-Q5U at Amazon.com