HP EliteBook 840G1: Sometimes it's an Ultrabook, sometimes it's not • The Register
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
M.2(2280)SSD can't install HP elitebook 840 G1 i7 - YouTube