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Unlike previous versions of Windows, XP has native support for processor performance control. The operating system has built-in support for Intel SpeedStep and AMD PowerNow! Thus, the applets previously required for use with Windows ME, 98, et cetera are no longer necessary.
Processor-throttling technology is dandy, but how do I disable it?
Navigate to Start > Control Panel > Power Options and set the power scheme to Home/Office Desk or Always On.
Home/Office Desk > None (AC) > Adaptive (Battery)
Portable/Laptop > Adaptive (AC) > Adaptive (Battery)
Presentation > Adaptive (AC) > Degrade (Battery)
Always On > None (AC) > None (Battery)
Minimal Power Management (AC) > Adaptive > Adaptive (Battery)
Max Battery > Adaptive (AC) > Degrade (Battery)
Adaptive = Performance state chosen based on CPU demand
Degrade = Starts at lowest performance state, then uses linear performance reduction (stop clock throttling) as battery discharges
None = Always runs at highest performance state
For more information, see:reference
Can I permanently disable this in the registry?
Open your registry, create a new DWORD value, or search and modify the existing value, called "HackFlags." Edit the value according to the settings below.
0 = disable native XP support
1 = use settings inherited from Intel software during XP upgrade
5 = give XP complete support and control over the processor speed; system can support all modes when running on battery
Why does the System Properties dialog box display the CPU speed as 849MHz or 848MHz even though I have an 850MHz CPU and power management is disabled?
According to Microsoft, "because of minor variations in clock frequencies for the CPU and system bus, the current speed may differ from the maximum speed."
Microsoft addresses this issue in the following Knowledge Base articles:
Q311051 - Q303602
Where can I download the SpeedStep Applet for Windows XP/ME/9x/NT/2000?
Intel does not provide the software for download from their site. Check with your notebook PC vendor for the applet. An applet for Windows XP does not exist since the drivers have been included with the operating system.
How can I determine the maximum frequency my Intel mobile processor is capable of running at?
Download the Intel Processor Frequency ID Utility. For mobile processors, the utility should run a special test to determine the maximum frequency the processor is capable of running at.