Jim "The Scottish Hammer" from AdoredTV talks Interposers for Dummies, and he does it quite well, then breaks into talking about Chiplets.
Check out the video.
I saw cageymaru posted this in the Ryzen leaked benchmarks thread, but thought it warranted its own thread:
https://hardforum.com/threads/leaked-amd-ryzen-benchmarks.1920876/page-21#post-1042831422
This is the article in which I saw this...