RB911G-5HPacD mainboard：https://mikrotik.com/product/RB911G-5HPnD#fndtn-downloads.There's no PCIe slot but rather a Qualcomm Atheros QCA9558 chip which is the CPU, and a Qualcomm QCA9882 which is the 5ghz radio (both soldered directly to the board). The board ships with RouterOS (Mikrotik) and the radio obviously works under routerOS, but not OpenWRT (which is what I was hoping to use for this project.
Details
Wireless 5 GHz Max data rate 867 Mbit/s
Wireless 5 GHz number of chains 2
Wireless 5 GHz standards 802.11a/n/ac
Wireless 5 GHz chip model QCA9892
Wireless 5 GHz generation Wi-Fi 5
So with all the links you've probably visited, what was your error or outcome? Got logs? Visuals? PowerPoint Presentation? 
dmesg; ubus call system board
check if the image shipped with the packages required for wifi support ...
start with kmod-ath*