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
8GB 2 x 4GB DDR3 Memory for Lenovo ThinkPad X220 X220i PC3-10600 1333MHz 204 pin SODIMM Laptop Notebook RAM (PARTS-QUICK Brand) at Amazon.com
How to Install Memory (RAM) into a Lenovo X220 Laptop - YouTube
Used 95New Lenovo ThinkPad X220 Notebook Computers 4GB Ram 128G SSD Laptop 1280x800 12 Inches Win7 Diagnosis Computer Pc Tablet _ - AliExpress Mobile
New RAM for a Lenovo X220 - Céondo - Fluid Phase Equilibria, Chemical Properties & Databases
Lenovo Thinkpad X220 Repair - iFixit
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