CMS 8GB (2X4GB) DDR3 8500 1066MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with Lenovo® Thinkpad X201 3249-Xxx; 3626-Xxx; 3680-Xxx - A35 at Amazon.com
X201, I think from about 2010 or 2011. It's a little slow, but with the ssd, 8gb ram (instead of 4) and running Linux Mint, it sure isn't bad for a 10+
A-Tech 4GB RAM for Lenovo THINKPAD X201 | DDR3 1066MHz SODIMM PC3-8500 204-Pin Non-ECC Memory Upgrade Module at Amazon.com
Lenovo ThinkPad X201 Subnotebook - The Small & Mighty Laptop! - YouTube
RAM causing my Lenovo X201 to shut down? I have a X201 with 4GB right now (2 sticks of 2GB) and I was trying to upgrade to 2 sticks of 4GB each
OFFTEK 4GB Replacement Memory RAM Upgrade for IBM-Lenovo ThinkPad X201 (All Types) (DDR3-8500) Laptop Memory at Amazon.com
Lenovo debuts ThinkPad X201 and W701 series laptops with Core i5, i7 | ZDNET
Lenovo ThinkPad x201 i5 2.4GHz 4GB 320 Windows 10 Pro 64 Laptop CAM - Walmart.com