CMS 16GB (2X8GB) DDR3 10600 1333MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with Lenovo® Thinkpad X220 4287, 4290, 4291 Ddr3-1333 - A13 at Amazon.com
Arch Memory 4GB 204-Pin DDR3 1333 MHz So-dimm RAM for Lenovo ThinkPad X220 Tablet 4296-37U at Amazon.com
Finally upgraded the RAM in my X220 : r/thinkpad
New RAM for a Lenovo X220 - Céondo - Fluid Phase Equilibria, Chemical Properties & Databases
Is this a good laptop? ThinkPad x220 i7-2620M, 8 Gb ram, IPS screen. How to get 5 ghz WiFi and bluetooth 4 or 5 on it? Maybe some other useful upgrade? : r/thinkpad
Used Laptop Lenovo ThinkPad X220 Notebook Computers 4GB/8GB Ram 1280x800 12 Inches Win7/10 English System Diagnosis Pc Tablet
Lenovo X220 Tablet - Core i5 2520m @ 2.50GHZ/4GB RAM/320GB HD/IPS/Win – The Mighty PC