PCIe 4.0 support UNLOCKED on GIGABYTE X470/B450 motherboards
Amazon.com: ASUS ROG Strix B450-F Gaming II AMD AM4 (Ryzen 5000, 3rd Gen Ryzen ATX Gaming Motherboard (8+4 Power Stages, HDMI 2.0b/DP,2 x PCIe 3.0 x16, USB 3.2 Gen 2 Type-C, BIOS
B450 pcie 4 support - CPUs, Motherboards, and Memory - Linus Tech Tips
B450 TOMAHAWK MAX II Gaming Motherboard (AMD Ryzen 3000 3rd gen ryzen AM4, DDR4, M.2, USB 3.2 Gen 1, Wi-Fi, HDMI, ATX)
B550 motherboard guide: ASUS and AMD bring PCI Express 4.0 to everyone with ROG Strix, TUF Gaming, and Prime - Edge Up
AMD To Disable PCIe 4.0 Support In Final X470/B450 BIOSes After X570's Launch
PCIe 4.0 on B450 prayer : r/Amd
These ASUS X470 And B450 Boards Support PCIe 4.0! – Pokde.Net
Amazon.com: ASUS ROG Strix B450-F Gaming II AMD AM4 (Ryzen 5000, 3rd Gen Ryzen ATX Gaming Motherboard (8+4 Power Stages, HDMI 2.0b/DP,2 x PCIe 3.0 x16, USB 3.2 Gen 2 Type-C, BIOS
ASUS Begins Enabling Limited PCIe Gen 4.0 on AMD 400-series Chipset Motherboards | TechPowerUp