All ASUS 500 series motherboards (X570, B550 and A520) are optimized and ready for AMD Ryzen Zen 3 processors.
ASUS is committed to providing the best BIOS support and will continue to optimize the BIOS to offer the best performance and user experience. For a full list, please refer to the table below. ASUS did not yet announce support for any 400 series motherboards.