Several ASUS X470 and B450 motherboards will support PCI Express 4.0
Although, after first opening the door that X470 motherboards could support PCIe 4.0, AMD finally ensured that X470 motherboards would not have PCIe Express 4.0.
It seems that at least on some ASUS motherboards, we will have support for PCI Express 4.0 technology in models with chipset X470 and even the B450. It will be in different variants, for example not all boards will support PCIe4 x16, others will stay at x8 and others at x4 or, directly, without support.
If we talk about PCIe4 support on the PCIe port, specifically with the X470 chipset, only the ASUS TUF X470-PLUS Gaming will support PCIe Gen4 x16, however with the B450 chipset the number is much higher with up to 10 ASUS B450 motherboards with support for PCIe 4.0 x16.
The thing changes if we look at support for PCIe4 x8, in that case only the ASUS ROG Strix x470-F Gaming motherboards and the Prime X470 Pro will support this technology in x8 mode.
As for the main M.2 porthe practically all boards will support PCIe 4.0 x4 mode except for the TUF X470-PLUS Gaming.
It seems that most of the owners of ASUS B450 and X470 motherboards are in luck since, at least for now, where PCIe 4.0 will be able to be used at the domestic level will be, precisely, in NVMe M.2 SSDs.