CMS 4GB (1X4GB) DDR2 6400 800MHZ NON ECC SODIMM Memory Ram Upgrade Compatible with Dell® Latitude E6400, E6400 Atg, E6400 Xfr - A42 - Walmart.com
8GB 2x4GB PC2-6400 DDR2-800 Memory for Dell Latitude E6400 ATC , E6500 Upgrade | eBay
My faithful workhorse of 5 years. Here is my upgraded dell latitude e6400 atg! : r/Dell
Solved: Latitude E6400 touchpad not working after Windows 10 install - Dell Community
RAM memory for Dell Latitude E6400
Dell E6400 hard drive & RAM upgrade (replacement) – October 15, 2015 | P&T IT BROTHER - Computer Repair Laptops, Mac, Cellphone, Tablets (Windows, Mac OS X, iOS, Android)
CMS 4GB (2X2GB) DDR2 6400 800MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with Dell® Latitude E6400, E6400 Atg - A39 at Amazon.com
Dell Latitude E6400 RAM Replacement - iFixit Repair Guide
8GB 2X4GB Memory RAM for Dell Latitude E6400 XFR 200pin 800MHz PC2-6400 DDR2 SO-DIMM Black Diamond Memory Module Upgrade System Specific Memory - Newegg.com
Dell Latitude E6400 RAM Replacement - iFixit Repair Guide