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
Lenovo Thinkpad T520 CPU upgrade Core i5 2520M to i7 2760QM - YouTube
Restored Lenovo ThinkPad T520 - Walmart.com
HP Thin Client: t520
My dad just gave me his daily driver t520, what upgrades should I consider first? : r/thinkpad
HP Thin Client: t520
Tuning the Lenovo T520 - Upgrading Memory and Installing an mSATA SSD • Helge Klein