Dell Inspiron 4000 - Manual (Page 22)

To change the Intel SpeedStep options, click the Advanced button and then click one of the following options.
l Disable Intel SpeedStep technology control.
l Remove flag icon.
l Disable audio notification when performance changes.
Click Apply to accept any changes, and then click OK to close the Intel SpeedStep technology window.
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HINT: If you disable Intel SpeedStep, the processor operates at its minimum speed.