How to Upgrade Ram on HP Elitebook 840 G5 | Add Memory or Change Battery and SSD - YouTube
Upgrading Memory RAM in HP 840 G1 EliteBook, 840 G2 or 840 G3 - YouTube
CMS 16GB (2X8GB) DDR3 12800 1600MHz Non ECC SODIMM Memory Ram Upgrade Compatible with HP/Compaq® Elitebook Folio 9470M Ultrabook Energy Star - A7 at Amazon.com