Thunderbolt provides external access to the PCIe bus (nothing more... nothing less).
Under ideal circumstances, you'll achieve PCIe level performance with an external audio interface.
As long as you meet all the following conditions, Thunderbolt-3 works great:
- Motherboard with integrated Thunderbolt-3 controller or motherboard that supports a TB3 add-in-card (must have a TB3 header and the BIOS must support that specific controller).
- Up-to-date Win10 install
- Drivers for your audio interface must support "PCIe via Thunderbolt" under Win10
- Unless you're running the UA Arrow, you'll need a Thunderbolt-3 (USB-C) to Thunderbolt-2 adapter