Thunderbolt can only be added, if your board/bios is designed for thunderbolt.
As an option, I suggest adding a PCIe card for USB3, see manual for supported chipsets.
The Sonnet card below is proven to work well:
— supported FL1100 chipset, see RME manual
— supported by Win10
— its driver uses the more efficient MSI, messaged signalled interrupts.
You only need a PCIe x1 socket for such a card, preferably a PCIe socket on your mainboard with PCIe lanes coming from the Chipset. Your mainboard manual should contain a block diagram which tells you which socket have PCIe lanes coming from CPU and which come from Chipset.
https://www.sonnettech.com/product/alle … 4port.html
You need to check, but the card seems to share it's 4 USB3 ports with the same USB3 controller on board.
So, I would only the UFX+ to it, so that the UFX+ is isolated.
Using USB3 has the advantage to you, to support cable length up to 3 m.
This Lindy premium cable works well, it has 3 shields, good plugs and is not too expensive:
https://www.lindy.co.uk/cables-adapters … ine-p11345
BR Ramses - UFX III, 12Mic, XTC, ADI-2 Pro FS R BE, RayDAT, X10SRi-F, E5-1680v4, Win10Pro22H2, Cub14