SOLVED: Are 16GB RAM (2x8Gb) possible on my Lenovo T400? - Lenovo Laptop T400 - iFixit
Lenovo T400: How to upgrade the RAM - YouTube
Lenovo ThinkPad T400 Laptop (6474-11U) Intel P8400, 2GB RAM, 160GB HDD, 14-inch 1280x800, Windows Vista Business 32-Bit : Amazon.in: Computers & Accessories
8GB KIT (2 x 4GB) for IBM Lenovo ThinkPad T Series T400 T400s T500. SO-DIMM DDR3 Non-ECC PC3-8500 1066MHz RAM Memory. Genuine A-Tech Brand. at Amazon.com