Does fan rpm scale linearly with CPU temperature?

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darkstar845

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Mar 29, 2010
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For example, a Hyper 212 Evo with the default fan and a Core i7 3770k. The fan speed has been set manually, at full load @800RPM the CPU temp is say for example 65°c and then @1000RPM, the temp is 60° and then @1200, the temp will be 55°. Will it scale linearly up to 2000RPM?

Just curious, I know I could test this on my own but I am lazy and my fan doesn't support exact RPM configurations.
 
Solution
makkem
Hi
In a word no.
In thermodynamics the rate of heat transfer from the hot surface (heatsink) to the cooler surface (fan blown air) is greatest when the difference in temperatures is greatest.
Since the fan blown air is always at ambient temperature(the movement of air removes hot air from the heatsink)it gets increasingly inefficient at cooling the heatsink the closer the heatsink temperature approaches ambient.
So you have the law of diminishing returns,the fan speed would have to increase logarithmically to cool the heatsink in a linear manner.
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makkem

makkem

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Jan 22, 2012
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Hi
In a word no.
In thermodynamics the rate of heat transfer from the hot surface (heatsink) to the cooler surface (fan blown air) is greatest when the difference in temperatures is greatest.
Since the fan blown air is always at ambient temperature(the movement of air removes hot air from the heatsink)it gets increasingly inefficient at cooling the heatsink the closer the heatsink temperature approaches ambient.
So you have the law of diminishing returns,the fan speed would have to increase logarithmically to cool the heatsink in a linear manner.
 
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