OFFTEK 4GB Replacement Memory RAM Upgrade for IBM-Lenovo ThinkPad T520 (DDR3-12800) Laptop Memory at Amazon.com
A-Tech 8GB (2 x 4GB) RAM for Lenovo THINKPAD T520 4240 | DDR3 1333MHz SODIMM PC3-10600 204-Pin Non-ECC Memory Upgrade Kit at Amazon.com
4GB RAM Memory for Lenovo ThinkPad T Series T520 Black Diamond Memory Module DDR3 SO-DIMM 204pin PC3-10600 1333MHz Upgrade - Walmart.com
Lenovo Thinkpad T520 CPU upgrade Core i5 2520M to i7 2760QM - YouTube
8GB Stick 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
Tuning the Lenovo T520 - Upgrading Memory and Installing an mSATA SSD • Helge Klein