ASRock AB350 Pro4, $90 - https://www.newegg.com/Product/Product.aspx?Item=N82E16813157761&cm_re=am4-_-13-157-761-_-Product
ASRock Fatal1ty AB350 Gaming K4 , $104 - https://www.newegg.com/Product/Product.aspx?Item=N82E16813157759&cm_re=am4-_-13-157-759-_-Product
ASRock Fatal1ty X370 Gaming K4, $149 - https://www.newegg.com/Product/Product.aspx?Item=N82E16813157758&cm_re=am4-_-13-157-758-_-Product

MSI X370 GAMING PRO CARBON, $179 - https://www.amazon.com/MSI-X370-GAMING-PRO-CARBON/dp/B06WGS4FJL/ref=sr_1_6?s=pc&ie=UTF8&qid=1488707250&sr=1-6&keywords=am4


ASUS Prime X370-Pro, $170 - https://www.amazon.com/Prime-X370-Pro-Ryzen-Motherboard-Lighting/dp/B06WD4N297/ref=sr_1_5?s=pc&ie=UTF8&qid=1488707250&sr=1-5&keywords=am4

By the way, R7 1700 is 500h/s in XMR, https://forums.servethehome.com/index.php?threads/monero-mining-performance.12116/

Does anyone has these mobos and can test them for mining?

I'm tempted to go with the cheapest ryzen cpu when Vega launches (Ideally 4C4T, but it might not launch before vega). It brings some XMR mining ability, the ability to cpu mine new coins and handle high cpu load unoptimized miners (like in the early days of zcash) and imo, slower depreciation and easier resell of the cpu and mobo. It will be good to know if 6 gpus work.