Hey everyone, my friend recently came up to me saying that he would like to upgrade his laptop's WiFi card caps his laptop's at 20Mbps (on a good day).

The laptop currently has a single band AzureWave AW-NB097H based on the Atheros AR9004WB chipset. He wants my help to upgrade to a card that supports AC WiFi.

I was thinking to get an Intel AC-7260HMW as an upgrade as the form factor fits and his laptop already has both Main and Aux antennas built-in.

So would this work? Can the old antennas effectively receive AC WiFi and 5 Ghz connections? What are the problems I should expect if I proceed with his upgrade?

Laptop specs are as below:

Asus K55VD
Intel Core i5 (Third gen)
Nvidia GT 610m
8GB DDR3 RAM
Windows 10 Home

Any advice and help are greatly appreciated, thanks!