You may be able to get PCIe 4.0 on these ASUS X470 and B450 boards - HardwareZone.com.sg
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ASUS B450 boards apparently support PCIe 4.0 now | guru3D Forums
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
List of PCI EXPRESS 4 Support on ASUS X470 & B450 Boards - YouTube
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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
Alleged ASUS X470/B450 PCIe 4.0 Compatibility Table Paints A Confused Picture
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These ASUS X470 And B450 Boards Support PCIe 4.0! – Pokde.Net
ASUS B450 boards apparently support PCIe 4.0 now | guru3D Forums
Asus publishes X470 and B450 PCIe Gen 4 compatibility chart - Mainboard - News - HEXUS.net
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ROG STRIX B450-F GAMING II | Gaming motherboards|ROG - Republic of Gamers|ROG Global
ASUS ROG Strix Z690-F Gaming WiFi 6E LGA 1700(Intel® 12th&13th Gen) ATX gaming motherboard(PCIe 5.0, DDR5,16+1 power stages,2.5 Gb LAN,Bluetooth v5.2,Thunderbolt 4,4xM.2/NVMe SSD and Front panel USB 3 - Walmart.com
ASUS ROG STRIX B450-F GAMING | ROG - Republic Of Gamers | ASUS USA
New Asus X570 F Gaming Atx Motherboard 4.0 Intel Dual M.2 Laptop Tested - Motherboards - Aliexpress
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Enabling PCIe 4.0 on a B450 Motherboard? - YouTube