Lenovo ThinkPad Laptop Computer T400 14" Dual Core 2.0GHz 4GB 320GB Windows 10-64 Home WiFi
Lenovo ThinkPad T400 Memory Upgrades @Memory.NET
Lenovo Laptop ThinkPad T400 Notebook - Core 2 Duo 2.40GHz - 4GB DDR3 - 160GB - DVDRW - Windows 7 Pro 64bit - Used with FREE 3 Year Warranty provided by CPS. - Walmart.com
CMS 8GB (2X4GB) DDR3 8500 1066MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with Lenovo® Thinkpad T400 2764, 2765, 2766, 2767, 2768 - A35 at Amazon.com
memory - Does Lenovo T400 can only work with up to 4GB RAM? - Super User
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