The new Intel 9th generation Core processors will support up to 128 GB DDR4 RAM as revealed by a footnote in one of HP's announcements, which was later confirmed by Anandtech. This is made possible due to the availability of double height double capacity modules from Zadak and G.Skill and Samsung's 16 GB DDR4 chips.
https://www.notebookcheck.net/Intel-9th-Generation-Core-processors-can-support-up-to-128-GB-DDR4-RAM.338638.0.html