In the past, it was super easy to find a block diagram illustrating that architecture on the Web. For Windows 10, I can't find anything. I've found subsystem diagrams, Windows 7 or earlier ...

Another block diagram of a more official nature leaked, this one holds the X570 chipset breakdown alongside the specs and Ryzen 3000. It's clear already that Ryzen 3000 CPUs (Matisse) and the X570 ...

The new block diagrams are courtesy of leaker Olrak. AMD's next-gen Navi 31 and Navi 32 will reportedly be MCD (multi-chip designs) while Navi 33 will continue on being a monolithic GPU design.