Lenovo thinkpad L520 the only upgrade you will ever need - YouTube
501647U - Lenovo ThinkPad L520
16GB KIT (2 x 8GB) for IBM Lenovo ThinkPad L Series L412 L420 L512 L520. SO-DIMM DDR3 Non-ECC PC3-10600 1333MHz RAM Memory. Genuine A-Tech Brand. at Amazon.com