Your MacMini supports multiple cpu
frequences. Using multiple frequences can even reduce power consumption but without reducing your cpu power. The used frequence depends on the demanded processes. If you give the command# cat /proc/cpuinfo
you can see the actual used cpu frequence.
# cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_driver
ansers with 'centrino', which means that your MacMini would use the centrino driver.
Have much fun with the energy efficient MacMini as your preferred SME home server platform !