Hynix Original 16GB (1x16GB) Laptop Memory Upgrade Compatible for HP EliteBook 840 G3 DDR4 2133Mhz PC4-17000 SODIMM 2Rx8 CL15 1.2v DRAM Notebook Adamanta at Amazon.com
16GB Memory HP EliteBook 840 G3 DDR4 RAM Upgrade
HP EliteBook 840 G6 Healthcare Edition Notebook PC - Illustrated Parts | HP® Customer Support
Replacement Backlit Keyboard Compatible with HP EliteBook 840 G3 840 G4, EliteBook 848 G3 848 G4, EliteBook 745 G3 745 G4 - Maraya Global
HP EliteBook 840 G7 Notebook PC - Illustrated parts catalog | HP® Customer Support