Just completed an off-line exchange that encouraged me to remind the Community that with Release 15.1.3 the PMP 450m supports PMP 430 SMs. So, if you have 430 SMs deployed in your network and seeking a migration path to higher data rates for the system as a whole consider upgrading to Release 15.1.3 (or later) and replace your PMP 430 AP with a PMP 450m. There is a short training video on Release 15.1.3 available at https://training.cambiumnetworks.com and download the release itself at https://support.cambiumnetworks.com/files/pmp450/
Scott