This leaves Samsung as the onlyalternative option. TechPowerUp reports it's rumored that AMD may use Samsung for the production of lower-end parts:
That's what originated form the rumor mill. Speculating, this could mean that AMD would be looking to outsource products with generally lower ASP to Samsung's foundries, instead of trying to cram even more silicon manufacturing onto TSMC's 7 nm process (where it already fabricates its Zen 3, RDNA 2, EPYC, and custom silicon solutions for latest-gen consoles). AMD might thus be planning on leveraging Samsung's 8 nm or even smaller fabrication processes as alternatives for, for example, lower-than-high-end graphics solutions and other product lines (such as APUs and FPGA production, should its acquisition of Xilinx come through).