To "undervolt" and/or "underclock" a system reliably, the system must
support it. Typically you want adjust the frequency scaling (if
available), and there are multiple ways to do it, from simple sysctl
commands to more complex dynamic frequency scaling daemons.<p><a href="http://www.thinkwiki.org/wiki/How_to_make_use_of_Dynamic_Frequency_Scaling" rel="nofollow">http://www.thinkwiki.org/wiki/How_to_make_use_of_Dynamic_Fre...</a><p><a href="http://www.thinkwiki.org/wiki/How_to_reduce_power_consumption" rel="nofollow">http://www.thinkwiki.org/wiki/How_to_reduce_power_consumptio...</a>