HP Elitebook 840 G1 RAM Replacement - iFixit Repair Guide
Amazon.com: HP Elitebook 840 G5 14-inch FHD (1920x1080) Business Laptop (Intel Quad-Core i5-8250U, 16GB DDR4 RAM, 512GB SS USB Type-C, HDMI, Windows 11 Pro (Renewed) … : Electronics
HP EliteBook 840 G6 RAM Replacement - iFixit Repair Guide