With the 2018 EliteBooks, HP has put a focus on premium-features such as a Unibody-design and higher-quality displays – which of course also raises the costs. To bridge the gap compared with its older EliteBooks, HP has released a refresh of its older EliteBook 840 G4, which brings the newest CPUs to the older design.
https://www.notebookcheck.net/EliteBook-840r-G4-HP-releases-a-Quad-Core-refresh-of-the-older-EliteBook-design.299212.0.html