HP Elitebook 840 G1 RAM Replacement - iFixit Repair Guide
HP Elitebook 840 G1 14" Laptop i5-4300U - Windows 10 - Grade
HP Elitebook 840 G1 RAM Replacement - iFixit Repair Guide
How to upgrade RAM memory in HP Elitebook 840 G1 laptop - YouTube
Refurbished: HP Laptop Grade A EliteBook 840 G1 Intel Core i5 4th Gen 4300U (1.90 GHz) 8 GB Memory 240 GB SSD Intel HD Graphics 4400 14.0" Windows 10 Pro 64-Bit - Newegg.com
Stonetaskin 802523-601 802523-001 For Hp Elitebook 840 G1 Motherboard Upgrade I3 I5 6050a2560201-mb-a03 Uma W I7-4500u Cpu Mb - Laptop Motherboard - AliExpress