The MPG B550 Gaming PLUS supports 3rd Gen AMD Ryzen Processors and with the addition of PCIe 4.0 technology you can expect a lightning fast gaming experience plus with Wi-Fi 6 you have access to ...

Another thing to note here is, even if your setup doesn't allow PCIe 4.0 on the m.2 with the GPU at Gen3, the Samsung 980 Pro only loses 8-10 MB/s running in PCIe 3.0 mode 4KQ1.

This isn't the first time a B550 chipset has been spotted lacking PCIe 4.0 support. Earlier, AMD's OEM partners were using a certain "B550A" chipset in Ryzen pre-builts.