Tom's Hardware takes a look at the ASRock X399 Fatal1ty Professional Gaming Motherboard
A quote from the article:
The ASRock Fatal1ty X399 Professional Gaming motherboard (priced around $390) performs just as well as the company's X399 Taichi, but has the added benefit of the 10Gb network controller. This board has some deficiencies from a gamer’s perspective, but would work well for a system that calls for 10Gb throughput and utilization of all the PCIe slots (something most boards can’t handle).ASRock X399 Fatal1ty Professional Gaming Motherboard Review