Refurbished: Dell Latitude E6540 15.6" Laptop, Intel Core i7 4600M 2.9Ghz, 16GB DDR3 RAM, 1TB Hard Drive, Full HD 1080p, HDMI, Windows 10 Pro x64 - Minor Wear - Newegg.com
Refurbished: Dell Latitude E6540 Laptop, Quad Core i7 4800MQ 2.7Ghz, 16GB DDR3, 960GB SSD Hard Drive, 1080P 15.6" FHD LCD, AMD Radeon HD 8790M 2GB GDDR5, HDMI, Windows 10 Pro - Newegg.com
Dell Latitude E6540 disassembly and RAM, HDD upgrade options | MyFixGuide.com
Amazon.com: Dell Latitude E6540 15.6inch Laptop, Core i7-4800MQ 2.7GHz, 16GB Ram, 500GB SSD, DVDRW, Windows 10 Pro 64bit, Webcam (Renewed) : Electronics