AMD's use of a multi-chip module (MCM) approach offers quite a few advantages for AMD in terms utilizing TSMC's lines efficiently and also in driving down costs. We are now getting to know that Ryzen 3000 sports a new Infinity Fabric version that offers twice the bandwidth of the previous generation. The chiplet design should also enable AMD to disable cores with minimal loss to cater to the entry level and mid-range markets.
https://www.notebookcheck.net/AMD-Ryzen-3000-s-MCM-design-enables-optimal-utilization-of-the-7-nm-process.414980.0.html