All that depends on the thermal resistance of your cooling setup, how well you've insulated, and your intended power supply.
Here's a good 'reference' formula (I say reference because it assumes ideal conditions, and 100% input power):
CPUTEMP = Ambient - ((1 - HeatOfCPU/MaxQ)*deltaT)
Figure out what kind of temps you want, and then solve for MaxQ. Remember, HeatOfCPU changes as the voltage changes. Look for an article from me soon.
Rich W.
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