sfx2000
Part of the Furniture
Review was done with 166845 firmware, which was installed on the router and the only one released to the wild AFAIK on production (not beta test) product.
5 GHz channel width was left at its default Auto, which enables 80 MHz bandwidth mode. I've corrected that in the review.
There is nothing that says an AC2600 class (or any other class for that matter) router must have the ability to force mode and bandwidth mode.
For most folks, anything aboveAC1900 class is at best AC1900 class...
Just saying - there's a distinct lack of clients that could do more...
edit - damn autocorrect...