ASRock X99E-ITX/ac (Intel SKT 2011-3) @ techPowerUp
 

What do you do when you want a PC with a small footprint, but a powerful CPU? You buy an mITX motherboard. But what if you want EIGHTEEN CORES and THIRTY-SIX threads? You buy the ASRock X99E-ITX/ac. Doing the unexpected by bringing Intel's X99 Express to the mITX form-factor, the ASRock X99E-ITX/ac can push those 18-core Xeon chips and has an X-OC socket to push Intel's standard unlocked chips to the limit. And USB 3.1. And a CPU cooler is in the box.

http://www.techpowerup.com/reviews/ASRock/X99E-ITX_AC/