My faithful workhorse of 5 years. Here is my upgraded dell latitude e6400 atg! : r/Dell
Dell Latitude E6400 RAM Replacement - iFixit Repair Guide
Dell Latitude E6400 Laptop, 14.1" Display, Intel Core 2 Duo Processor, – TekRefurbs
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
4GB Memory RAM for Dell Latitude E6400 200pin PC2-6400 800MHz DDR2 SO-DIMM Black Diamond Memory Module Upgrade - Walmart.com
NIGERIAN USED: Dell Latitude E6400 – Intel Core 2 Duo – Super Clean – – Maxi Tech Store
Dell Latitude E6410 Laptop /Intel Core i5/4GB RAM/120GB SSD/Windows 7 Pro/New Battery, Computers & Tech, Laptops & Notebooks on Carousell
4GB Kit (2GB X 2) Memory Upgrade for Dell Latitude E6400 DDR2 PC2-6400 800MHz 200 pin SODIMM RAM (PARTS-QUICK Brand) at Amazon.com