I bought a dual band router and even though my other devices are connecting via 5GHZ, my MacBook Pro will only connect on the 2.4GHz bandwidth. Am I doing the settings wrong or is there something I can replace, like the internal Airport card? See specs below.

This Apple discussion link provides a variety of possible solutions. Check it out, your mileage may vary.

ROCKSTAR!!!

Turned off Airport, dumped pref, turned Airport on, 5GHz.