Solved: DDR4 RAM supported for HP Elitebook 840 G1 ? - HP Support Community - 6104538
HP Elitebook 840 G1 RAM Replacement - iFixit Repair Guide
How to upgrade RAM memory in HP Elitebook 840 G1 laptop - YouTube
HP EliteBook 840 G1 Business Laptop, Intel Core i5-4th Gen. CPU, 8GB DDR3 RAM, 256GB SSD, 14 inch Display, Windows 10 Pro, Refurbished Laptop
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HP EliteBook 840 G1 14" Laptop- 4th Gen Intel Core i5, 8GB-16GB RAM, Hard Drive or Solid State Drive, Win 10 PRO
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Upgrading Memory RAM in HP 840 G1 EliteBook, 840 G2 or 840 G3 - YouTube