Moved to Mobile section
ALL mobile AMD-CPUs support PowerNOW! - it is a power-saving feature that will dynamically adjust your CPU's clockspeed and voltage depending on CPU-utilization...i.e. if your not doing anything, the CPU will run with reduced clockspeed and voltage, thus saving power - if the CPU is being used(e.g. when playing a game) it will be automatically set back to full speed and voltage.
That's why your CPU is running at different speeds.
More info here
You can control PowerNOW! by setting power-schemes in the energy control panel.
If you're on A/C-power, you can select 'Always on' if you want your CPU to run at full speed all the time, basically disabling PowerNOW!.
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