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AMD officially supports PCIe Gen4 on both its B550 as well as X570 chipsets. However, buyers are advised to be careful when purchasing as certain B550 motherboards are dropping PCIe 4.0 support.
Pcie 3.0 RSS
While the bandwidth provided by PCIe 3.0 is found to be sufficient for most GPUs with adequate VRAM, the 4GB Radeon RX 5500 XT is found to be struggling possibly due to its PCIe x8 limitation.
