8GB 2 x 4GB DDR3 Memory for Lenovo ThinkPad X201 220 220i Tablet PC3-10600 1333MHz 204 pin SODIMM Laptop Notebook RAM (PARTS-QUICK Brand) 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 closer look at convertibles: Lenovo's ThinkPad X201 Tablet | ZDNET