OFFTEK 4GB Replacement Memory RAM Upgrade for HP-Compaq EliteBook 840 G3 (DDR4-17000) Laptop Memory at Amazon.com
16GB Memory HP EliteBook 840 G3 DDR4 RAM Upgrade
HP EliteBook 840 G3 Notebook PC Specifications | HP® Customer Support
16GB Memory HP EliteBook 840 G3 DDR4 RAM Upgrade
HP EliteBook 840 G3 MAX RAM? - ToxicNerd
Refurbished: HP Elitebook 840 G3 14" Full HD 1920x1080 Touchscreen Laptop PC, Intel Core i7-6600U 2.6GHz, 8GB DDR4 RAM, 512GB SSD, Windows 10 Pro x64 Grade A - Newegg.com