TRX40 motherboards from ASUS and ROG are ready to rip with third-gen Ryzen Threadripper CPUs - Edge Up
MSI B550M-A PRO Motherboard (AMD Ryzen 3000 3rd Gen AM4, DDR4, M.2, USB 3.2 Gen 1, HDMI, Micro ATX)
GIGABYTE B550M AORUS PRO AM4 AMD B550 Micro-ATX Motherboard
MSI blunder confirms existence of incredible 3rd Gen AMD Ryzen Threadripper 3990X with 64 cores and 128 threads of processing power - NotebookCheck.net News
Not all AMD 300-series AM4 motherboards may be 3rd Gen Ryzen CPU compatible | PCGamesN