My wifes laptop, a HP M6 x015dx has a Intel Centrino N2230. I want to upgrade to a 7260 AC WiFi card. Can I ? She has Windows 8.1. I have an AC1750 Archer router..
It depends if the "Intel Centrino N2230" is accessible and removable.
If so, then it will be a straight swap with the 7260 AC wifi card (as long as you get exactly the same form factor).