How do I configure my Thunderbolt header for daisy chain configuration?
Connect an add-on Thunderbolt™ I/O card to the specified PCIEX16(G4) slot then connect to your computer’s Thunderbolt™ cables. This provides additional connectivity options through Intel's Thunderbolt™ Technology.
From the official ASUS Tuf Gaming H770 Pro Wifi Motherboard manual, page 1
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