8GB (1X8GB) Memory Ram Compatible with HP/Compaq EliteBook 840 G1 by CMS A8 - Computer Memory Solutions
Memory RAM Upgrade for HP EliteBook 840 G1 4GB/8GB DDR3 SODIMM | eBay
Memory RAM Upgrade for HP EliteBook 840 G1 4GB/8GB DDR3 SODIMM | eBay
4GB Memory for HP EliteBook 820 G1, 820 G2, 840 G1, 840 G2, 850 G1, 850 G2 RAM | eBay
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
A-Tech 8GB Module for HP EliteBook 840 G1 Laptop & Notebook Compatible DDR3/DDR3L PC3-14900 1866Mhz Memory Ram (ATMS266381B30845X1) at Amazon.com