Arria V, ARM Cortex-A9 clock speed (the -3 version)

I have an industrial application that is forcing me to use the -3 core speed.

With that said I am trying to decrease the overall core speed of the ARM cores.

I see they are at 1GHz (as a -3 selection) and am looking to try and decrease them to around 500MHz to save power.

Is this possible?

I have been searching for various multiplier, clock speed sections and have come up short in manuals, forums, etc.

The goal is to get this Arria V to be as power lean as possible.

Thank you.