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It should be able to. You need to connect a cable between a functional DP output (either on a dGPU or from your iGPU) into the input on the rear I/O of the motherboard, and that output will then be output through the TB3 port - just like any other USB-C with DP Alt Mode. One can only hope that the board includes a very short DP cable for this. I guess it would be possible to make this work without an external cable, but that would likely either require even more hardware on a packed ITX board or at the very least compatibility testing with a bunch of dGPUs to ensure nothing gets borked. In other words, using an external cable is not that bad of a solution.