A-Tech 4GB Module for Lenovo ThinkPad T420 Laptop & Notebook Compatible DDR3/DDR3L PC3-12800 1600Mhz Memory Ram (ATMS350677B12034X1) at Amazon.com
Help, what should I price my T420 at? Very good condition, i5 2540M, 8gb ram, Quadro NVS 4200M, new 256gb ssd, 1600x900 display, Windows 10. : r/thinkpad
How to Replace or Upgrade RAM Lenovo T420 - YouTube