Hello,
Thanks for all your replies!
There are 2 5GHz networks on an ASU RT AC5300. You can set them up as separate SSIDs. However, the available channel ranges for the two are quite different:
1st 5GHz - auto,36, 40,44, 48
2nd 5GHz - auto, 149, 153, 157,161, 165
So the Killer wireless card...