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Common Options : 12.5%, 25.0%, 37.5%, 50.0%, 62.5%, 75.0%, 87.5%
This BIOS feature allows manual configuration of the Thermal Control Circuit. Instead of allowing the TCC to automatically start with a duty cycle of 30-50%, you can manually set the duty cycle.
Available options for this BIOS feature are set values of the processor's duty cycle when the Thermal Control Circuit gets activated. They range from a low of 12.5% to a high of 87.5%. Please note that these options reflect the processor's duty cycle, not its clock speed. The clock speed of the processor remains unchanged.
If you are looking for a Disabled option, there is no such option. You cannot turn off the Thermal Control Circuit. But if you keep your processor cool enough so that it never exceeds the maximum safe operating temperature, the Thermal Control Circuit will never get activated.
The default setting is usually 62.5%. This means the Thermal Control Circuit will insert null cycles to allow the processor to "rest" 37.5% of the time.
The choice of what you should set the Thermal Control Circuit to run at is really up to you. The lower the duty cycle, the slower your processor will perform but it will take less time to cool down the processor enough to turn off the TCC. Using a higher duty cycle will not impair performance as much but it will take longer for your processor to cool down enough to turn off the TCC.