parts-quick 16GB Memory for HP EliteBook 850 G3 DDR4 2133MHz SODIMM RAM at Amazon.com
Refurbished: HP EliteBook 850 G3 15.6" Touchscreen Laptop, Intel i5 6300U 2.4GHz, 16GB DDR4 RAM, 256GB NVMe M.2 SSD, 1080p Full HD, USB Type C, Webcam, Windows 10 Home - Grade B - Newegg.com