AMD Ryzen 5000/4000 will support up to 1TB of DDR4 RAM @ 3200 MHz : r/Amd
Some AMD Ryzen 7000 Zen 4 CPUs may support DDR4 RAM after all
Amazon.com: AWOW Mini PC, AMD Ryzen 5 5560U(6C/12T, up to 4.0GHz),16GB DDR4 RAM 512GB M.2 SSD, Dual 2.5GbE NIC Mini Desktop Computers Support 4K@60Hz Triple Display, AMG10 Mini Computer for Gaming/Home/Office :
At MSI, the AM5 motherboards support 192 GB of RAM! - Overclocking.com