Clock Speed
Overview
One can overclock or underclock the Pyra, or really any GNU/Linux machine, using the cpufrequtils package. In Debian, type into a terminal: sudo apt-get install cpufrequtils
. Search online for cpufrequtils to see documentation and usage.
Underclocking
Some small discussion on the boards regarding underclocking (for improving battery life): forum. At its lowest frequency, the Pyra CPU still will beat out a GHz Pandora model.