Lenovo ThinkPad T400 Hardware and Software Upgrade 2021 - YouTube
8GB (4GBx2) Team High Performance Memory RAM Upgrade For Lenovo ThinkPad T400 Series T410 Series Laptop. The Memory Kit comes with Life Time Warranty. at Amazon.com
SOLVED: Are 16GB RAM (2x8Gb) possible on my Lenovo T400? - Lenovo Laptop T400 - iFixit