Is Router OS support all PCI Atheros chipset based wireless cards?
i want to buy wireless card for x86 pc.
yes
so i can buy tp link TL-WN851N.
the most popular cards are mikrotik( r52hn is good performance) or alfa or compex
yes r52hn is good card but i have not pci to mini pci adapter
so tplink tl-wn851n is best for me
u already have the answer so what was ur question 
thanks mahnet