Most AMD Ryzen chipsets will support PCIe 4.0, except for the A320 chipset.
Most current Ryzen chipsets, with new BIOS, will support PCIe 4.0, except for the A320, the simplest chipset for AMD Ryzen.
More details are emerging about AMD's Ryzen 3000 processors . These processors, partially unveiled just a few hours ago, pose a significant challenge to Intel. Their high core count, strong performance, and competitive price make them an excellent solution for all types of users. These new processors come with a new chipset, the X570, which, among other improvements, adds PCIe 4.0 support. However, the 300 and 400 series chipsets will also be compatible with PCIe 4.0 if the motherboard manufacturer updates the BIOS. It's likely that the focus will be primarily on the B450 and X470 chipsets.
Most current AMD motherboards with BIOS update will not support PCIe 4.0
It seems that finally the vast majority of motherboards will offer PCIe 4.0 support, not being necessary to change the motherboard, but the processor. The one that will not receive this support will be the A320 chipset, the simplest of all AMD chipsets. Neither will these processors receive support for the new Ryzen 3000. If this chipset will receive support for the Ryzen 3000 APUs, this is because these APUs will be based on Zen +, not Zen2.
What PCIe 4.0 offers us is twice the bandwidth per channel than PCIe 3.0. We went from 32GB / s of PCIe 3.0 to 64GB / s of PCIe 4.0. The X570 will have the capacity to manage 40 PCIe 4.0 lanes, to which we must add the 16 PCIe 4.0 lanes of the processor for a graphics card. It means an increase in connectivity that is not free.
By having this new chipset with so many PCIe 4.0 lanes, twelve SATA III ports, eight USB 3.1 ports, four USB 2.0 ports, it has a consumption of 11W. It assumes that the X570 consumes almost twice as much as the X470 (6W) and hence the heat. The X570 is also 14nm from GlobalFoundries, who has not evolved further in lithographs and is on the verge of disappearing.
