Automatic variable clock & variable voltage free software "RightMark CPU Clock Utility (RMClock)"

Using this will eliminate the necessity of turning on the PC's power supply and worrying about electricity bills.
RMClock Utility. Products. CPU Rightmark
http://cpu.rightmark.org/products/rmclock.shtml

Operational subjects include Centrino platforms such as AMD K7, AMD K8, and Intel Pentium M, Intel Pentium 4 and Xeon, Crusoe of Transmeta, Efficeon.

Looks like this
http://cpu.rightmark.org/pic/rmclock2_1.png

It is possible to see in real time whether load and control are possible
http://cpu.rightmark.org/pic/rmclock2_2.png

Setting screen
http://cpu.rightmark.org/pic/rmclock2_3.png

It is possible to variably set about the power saving setting called "SpeedStep"
http://cpu.rightmark.org/pic/rmclock2_4.png

How to lower load by setting method
http://cpu.rightmark.org/pic/rmclock2_5.png

Even CPUs that have not been officially tested are said to have a possibility to operate effectively, so it may be useful if you are having trouble with CPU heat generation or want to keep the battery of a notebook PC for a while.