Hi, I do not own one. But I saw that will run with 16 different gpus and you have a diagnostic of ports inside the bios. Only small con is absence of power and reset buttons, but I i using the externals and watchdog, so it is pointless for me. If the asrock do not deliver new bios for h110 btc+ within the month for better stability, I will buy b250 mining from asus.

asrock mobo h110 pro btc+ is not able to handle more than 9x vega64

For now, rig is still stable for 22h and all 9 cards mining.
If its hold another 22h I started to thinking that the main issue is card/riser inside 16x slot... I had gen1 on all slots...
Gpu is 905 and mem 900. On the wall is about 1350W for whole system...

Windows with the latest updates removed cards limitation you can run 12 Amd cards and 8 Nvidia cards. Also both AMD and Nvidia released latest drivers to support this after Windows did. The problem is from the ASUS side, they need to bring a Bios update.