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
ThinkPad X220 Tablet – Eight Years and Counting | Martin Ueding
Ancient x220 freshly upgraded with 16GB RAM and started new career as a distro hopper. If you can't brake it, or sell it - use it! Also.... stickers ;) : r/thinkpad