CMS 4GB (1X4GB) DDR3 8500 1066MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with Lenovo® Thinkpad X201, X201 Tablet, X201I, X201S Ddr3 - A34 at Amazon.com
Amazon.com: Lenovo ThinkPad X201 Core i7-620LE 2.0GHz 4GB 160GB 12.1" Digitizer Display Tablet Windows 7 Professional w/3G Wireless : Electronics
Amazon.com: Lenovo ThinkPad X201 12.1 Inch Business Laptop, Intel Core i5-520M up to 2.93GHz, 4G DDR3, 120G SSD, WiFi, VGA, Windows 10 Pro 64 Bit Multi-Language Support English/French/Spanish(Renewed) : Electronics