how to check the speed of processor in windows xp [closed]

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when i right click on my computer ,in properties it shows Intel(R) Pentium(R) M processor 2.26GHz and also 279MHZ .so there are two speeds listed . but when i see using directx it shows only Intel(R) Pentium(R) M processor 2.26GHz when i see using msinfo32 it shows 798MHZ . in device manager it shows Intel(R) Pentium(R) M processor 2.26GHz .so how these speeds are displayed .

In CPU-Z it is showing: Name:Intel Pentinum M 780 Specification:Intel(R) Pentium(R) M processor 2.26GHz core Speed:798 MHZ

and another important thing is that when i view the system information on right clicking my computer it shows Intel(R) Pentium(R) M processor 2.26GHz,how this speed getting displayed ,is this the speed provided by manufacturer .and how the another speed 279MHZ is displaying.

Does windows displays the incorrect speed .because it is displaying the speeds does not match .

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There are various ways to retrieve the processor speed. Lately most processors use variable speeds to safe lots of energy while running. This is especially true on laptops in low power mode.

Sometimes multipe core speeds get added together so it shows extremely high speeds.

Easily copied from another question:

using System.Management;

public uint CPUSpeed()
{
  ManagementObject Mo = new ManagementObject("Win32_Processor.DeviceID='CPU0'");
  uint sp = (uint)(Mo["CurrentClockSpeed"]);
  Mo.Dispose();
  return sp;
}