Asus has unleashed its panel of motherboards that support AMD's B550 chipset on the US market. They enable up to 20 PCIe 4.0 lanes when equipped with a Ryzen 3000-series APU. These cost-effective new components are of the OEM's popular ROG Strix, TUF Gaming and Prime brands.
https://www.notebookcheck.net/PCIe-4-0-for-all-Asus-announces-its-B550-motherboard-line-up.476661.0.html