How to upgrade DELL Latitude E6400, E6500 or E6510 memory (RAM) - YouTube
OFFTEK 4GB Replacement Memory RAM Upgrade for Dell Latitude E6510 (DDR3-10600) Laptop Memory at Amazon.com
Refurbished: Dell Latitude E6510 15.6" LED Laptop Intel Dual-Core i5 Mobile CPU 8 GB DDR3 RAM 256 SSD DVD-RW WiFi Bluetooth Microsoft Windows 10 Professional 64-Bit - Newegg.com
Dell Latitude E6510 RAM Replacement - iFixit Repair Guide