SpeedswitchXP

With the help of SpeedswitchXP you can dynamically scale the frequency of notebook Intel and AMD microprocessors on Windows XP, in order to decrease the heat amount generated by the chip.
Once installed, the small application sits in the system tray area until called upon. You can specify the CPU speed plan on external power and battery (maximum performance, battery optimized, maximum battery, or dynamic switching), along with the display and disk timeout, and standby and hibernation entry time.
Furthermore, you can ask SpeedswitchXP to determine the maximum CPU speed, view a history diagram of the CPU speed and load, as well as view system information when it comes to the CPU data and power capabilities.
It is possible to set SpeedswitchXP to automatically run at system startup, minimize to the system tray on close, reactivate the previous power scheme on exit, check the power scheme integrity at a custom time interval, as well as to read the CPU speed and load.
Plus, you can establish the update interval, place a battery level in the tray with the remaining percentage or time (on battery power or always), as well as customize tray icon colors. Moreover, you can set the user, machine and CPU policies on battery and external power (e.g. maximum sleep state, idle timeout and sensitivity, fan throttle tolerance).
SpeedswitchXP is not a concern to the computer's overall performance, as it uses very low CPU and RAM. It has a good reaction speed and works smoothly. No error dialogs were shown in our testing, and the app did not hang or crash. In conclusion, SpeedswitchXP is a handy tool for any power user who wants to quickly adjust CPU settings and power management plans.