I've done a search of the forums and FAQ and come up with nothing outside of someone asking a related question.
 
Does the EVGA Z170 Classified K support third party Thunderbolt 3/USB 3.1 add in cards that are powered by Intel Alpine Ridge chipsets (TB3/USB3.1)?  Most of these cards seem to require a 5 port TB header, but is the 5 port TB header on the Classified K compatible?
 
Examples of TB3/USB 3.1 Alpine Ridge products.