CPU speeds (why is it that) ...

Sometimes when I am using Win XP ... and viewing the system properties (by right-clicking) on My Computer, then choosing the last option properties from the list ... and under the GENERAL tab ...  The list CPU type is NOT shown as the same as what is listed in the hardware specs of the computer?

For example, I have say a PIII 1.1 GHz CPU, but when viewing the system properties, the CPU is listed as being something completely different as a 897MHz or 928MHz CPU.  The CPU speed various from time to time when viewing the same System Properties section.

I have heard of CPU stepping ... and I'm not sure if this is or is not related, but can someone tell me what the deal is with this?

Thanks in advance for your time and any reply!
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If it is a laptop, the computer adjusts the CPU speed to fit the amount needed to achieve a better usage of the battery and heat-reduction. This is the speedstep property

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The CPU speed is a calculated value that can vary.
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