Gigabyte x570 Ultra Bios inquiry.
Gigabyte x570 Ultra Bios inquiry.
The board lacks a Thunderbolt 3 header and isn't officially promoted for that interface. The Pcie Tbt setting in BIOS likely exists for compatibility reasons or future-proofing, even though PCIe 4.0 boards are available. It might also relate to USB-C support, though that would probably require a different connector. The intention could be broader than just Thunderbolt 3, possibly aiming for versatile connectivity options.
They made a mistake while drafting the bios, omitting this feature from the specific motherboard. The best approach might be to check the bios comments (if any) for each revision to find references about it.