No, AMD Still Isn't Enabling PCIe 4 On 300/400 Series Boards – AnandTech

1. No, AMD Still Isn’t Enabling PCIe 4 On 300/400 Series Boards  AnandTech
2. Asus B450 and X470 Motherboards That Support PCIe 4.0 (Updated)  Tom’s Hardware
3. PCI-Express 4.0, An NVMe SSD On AMD’s X570  PC Perspective
4. Ryzen 3000: Asus opens up PCIe 4.0 support for selected X470 and B450 boards  guru3d.com
5. Best Motherboards for Ryzen 3000 CPUs: X570 vs. X470 & B450  Gamers Nexus
6. View full coverage on Google News

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