July 31st, 2006 by Keith

SpeedSwitchXP 1.51 – CPU Frequency Control for Notebooks Running Windows XP

Posted in Fun Stuff, Utilities, Windows


I have been using this application for a period of time, and it is absolutely wonderful and useful CPU Frequency Control software for Windows. Thanks to Christian Diefer for providing SpeedSwitchXP 1.51 free for users, running Windows XP.

SpeedswitchXP is a small applet that sits in the system tray and allows dynamic switching of the frequencies of mobile Intel and mobile AMD CPUs under Windows XP.

During the development of Windows XP, Microsoft decided to integrate dynamic frequency switching into the operating system itself. On a default Windows XP installation, the power schemes in the power settings of the system panel control the frequencies of the processor. On Windows 2000 and previous operating systems, it was possible to manually control the CPU frequencies with a SpeedStep applet provided by Intel, but this is not possible anymore under Windows XP. It is not very good documented what the different Windows XP power schemes do and it is impossible to fully adjust the schemes as the important settings are not accessible through the control panel.

As such, this is where SpeedSwitchXP comes in to fill this deficiency, providing users the access to ALL power scheme settings. The applet is similar in functionality to the native Intel SpeedStep applet for Windows 9x/ME and Windows 2000 but with a few more options. Basically all it does is creating a power scheme under the power settings in the system panel and making this the default power scheme for Windows XP. When this is done, you can control all settings of this new scheme through the applet.

As most desktop processors do not support dynamic frequencies switching, SpeedSwitchXP is mainly used in notebooks with processors that support dynamic speed switching. So, before you install this program, do check out if your processors do support dynamic frequencies switching. If your processors fall in the categories below, they are likely to support multiple speed frequencies:

  • - Mobile Pentium III-M (tested in Dell Inspiron 4100/8100, Dell Latitude C610/C810)
  • - Mobile Pentium 4-M (tested in Dell Inspiron 8200/8500, Dell Latitude C840)
  • - Mobile Pentium 4 (tested in Dell Inspiron 5150)
  • - Mobile Pentium M / Centrino (tested in IBM Thinkpad T40/T40p, Dell Latitude D800)
  • - Mobile AMD Athlon XP (tested in Peacock Freeliner XP, Fujitsu-Siemens Amilo A x600)

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