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Overdrive can mean any of the following:
OverDrive processors were Intel x86 CPUs specifically designed with the upgrading of obsolescent computers in mind.
See:
An overdrive in automotive and mechanical engineering is a form of gearbox and transmission with a gear ratio that causes the driven wheels to rotate at a higher Rpm than the engine, at a low torque. The advantage is a higher MPG rate. An overdrive is sometimes also (mistakenly) called a freewheel.