Biostar X370GTN is the first Ryzen Mini-ITX motherboard
 

Just like it was the first to race out of the gate with Ryzen-ready AM4 motherboards, Biostar is again first to market with a Socket AM4 board in mini-ITX form factor. The X370GTN just showed up on the company's website, and as its name implies, it uses the X370 chipset. Despite its small size, the X370GTN is a fairly full-featured motherboard, with a USB 3.1 Type-C port, a back-mounted PCIe x4 M.2 socket, and two DDR4 DIMMs supporting transfer rates up to 3200 MT/s.

http://techreport.com/news/31645/bio...tx-motherboard