Amd b550 and a520 lacking pcie 4.0 support?

We recently learned that, while AMD designs the X570 chip, ASMedia deals with the manufacture of the B550 and A520 chipset, which would become the successors of the current B450 and A320, both mid-range and low-end chipsets of the AM4 platform.

AMD B550 and A520 may lack PCIe 4.0 support or be very limited

Now we learn that these chipsets will have some kind of limitation when it comes to supporting PCIe 4.0, although it is not entirely clear exactly how this will be. There are two possibilities. Either chipset is either completely PCIe 4.0-free, or only the main PEG slot and M.2 slot of the SoC are PCIe 4.0.

Visit our guide on the best motherboards on the market

It seems that this last possibility is the most plausible, that the AMD B550 and A520 motherboards have at least one PCI-Express 4.0 x16 slot, and one M.2 slot that has PCI-Express 4.0 x4 cabling from the AM4 SoC. While the ASMedia chipset is connected to the SoC via PCI-Express 3.0 x4. These ASMedia AMD 500 chipset motherboards could also implement AMD's latest published PCB, CPU VRM, and memory cabling specifications that allow CPU and memory overclocking levels unattainable on older AM4 motherboards.

The B550 and A520 are expected to be able to offer significantly cheaper alternatives to motherboards with the AMD X570 chipset.

The new X570 motherboards along with third-generation Ryzen processors will debut on the market on July 7.

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