Lenovo 16GB PC3-12800 DDR3L-1600MHz SODIMM Memory - Overview and Service Parts - Lenovo Support US
0A33299 Lenovo Laptop Memory - directmacro.com
16GB KIT (2 x 8GB) for IBM Lenovo ThinkPad T Series T420 T420i T420s T520 T520i. SO-DIMM DDR3 Non-ECC PC3-10600 1333MHz RAM Memory. Genuine A-Tech Brand. at Amazon.com