I have a C4000 and a 2700sq ft home (but that's spread over 2 floors, so really more like 1500sq ft).

On my iPad it is great. I get almost 500/500mbps near the router, pretty much max out what I'm getting from my ISP, and around 100mbps in the rooms farthest away.

However, on my Samsung tablet S5e, which is supposed to have ac, and other older devices, the dropoff at the farthest point is pretty severe, to the point of non functioning.

My question is, will upgrading to an AX model improve 2.4/5ghz range for all devices over the C4000? Or only for ax devices, which I have none of as of now?

Also, which AX model has at least as good NAS performance as the C4000?

thanks