ASRock X299-ITX/ac Motherboard @ TechPowerUp
 

ASRock's X299-ITX/ac is that mini motherboard for Intel's X299 platform that takes all that is good and shoves it into a board smaller than a shoebox. With a triplet of M.2 ports and dual LAN chips, plus Wi-Fi, there's almost nothing missed, other than some PCIe slots, making this board an engineering feat only ASRock could accomplish.

https://www.techpowerup.com/reviews/ASRock/X299-ITX_ac/