Hi
Could anyone tell me exactly which wlan cad 802.11 AC works with MTx86? There is mess with this... I have AR9888 - not working. I need to use AC on x86 not on RB, so I want to know which model to buy.

It seems that the only Mikrotik's own wifi card supporting 802.11 ac is R11e-5HacD. And that one is built around QCA9882. If you find a card built around same chipset, chances are that it'll work. Or go for this card if miniPCIe format suits you.