You could also install a hardware fan controller (which is also essentially a resistor, albeit a variable one called a potentiometer). Due to the tachometer sensor discussed in the next section, you cannot put the resistor on the ground wire. Alternatively, you can purchase a LNA (low-noise adapter), which is essentially the same thing (although it saves you soldering in a resistor yourself). If you wish to slow your CPU fan down, you can install a resistor along the the power wire (+12V) in the fan. PWM fans require explicit support from both the motherboard and fan itself.
A three-pin fan connector does not include the ability to control speed dynamically, since it lacks the appropriate PWM control logic in the fan itself.
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