Tutorial: How to Upgrade T410/T420/400 Thinkpad Laptop to 8GB - YouTube
8GB 2X4GB Memory RAM for Lenovo ThinkPad T Series T410 204pin 1333MHz PC3-10600 DDR3 SO-DIMM Black Diamond Memory Module Upgrade System Specific Memory - Newegg.com
HD] Installing RAM on a Lenovo Thinkpad T420 Guide T410 T400 - YouTube