Gigabyte hasn't officially announced PCIe 4.0 support for its 300- and 400-Series motherboards, so it is unclear which models would support the faster interface, or if there will be limitations. It should go without saying, but you would also need a processor that supports PCIe 4.0 to unlock the faster transfer speeds, so current-gen Ryzen CPUs will still operate at PCIe 3.0 speeds.
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