Amazon.com: HP Elitebook 840 G1 14.0 Inch High Performanc Laptop Computer, Intel i5 4300U up to 2.9GHz, 16GB Memory, 256GB SSD, USB 3.0, Bluetooth, Window 10 Professional (Renewed) : Electronics
HP Elitebook 840 G1 RAM Replacement - iFixit Repair Guide
HP Elitebook 840 G1 Heatsink and Fan Replacement - iFixit Repair Guide
parts-quick 8GB Memory for HP EliteBook 840 G1 DDR3L 1600MHz PC3L-12800 SODIMM Compatible RAM at Amazon.com
HP EliteBook 840G1: Sometimes it's an Ultrabook, sometimes it's not • The Register
HP Elitebook 840 G1 RAM Replacement - iFixit Repair Guide
A-Tech 8GB Module for HP EliteBook 840 G1 Laptop & Notebook Compatible DDR3/DDR3L PC3-14900 1866Mhz Memory Ram (ATMS266381B30845X1) at Amazon.com