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PC Power Supply Discussion Troubleshooting and discussion of computer power supplies

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  #11  
Old 04-09-2012
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The fan's temperature control is based on the temp of the secondary heatsink. There's a diode there which changes properties based on the temp which then increases or decreases the fan speed.

It's a wire that runs to the secondary heatsink though, and not one integrated into the fan hub, as that would only regulate based on the intake temperature of the PSU and not the internal temps.

As for which is better, thermally controlled means the unit can be quieter at higher loads, but traditional stepped control can also be quiet to a certain degree.
Either or is just fine, just one is easier to predict than others (ala less factors to consider as traditional methods are only based on the DC load pattern.)
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Old 04-09-2012
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oh thank you very much

i assume that the sensor wire attached to the secondary heatsink goes directly to the fan.

in the future if i need to replace the fan, it need to be thermal based, because the thermal wire doesn't go trough PSU. correct?

ty
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Old 04-09-2012
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No, as you can see from this picture, the fan only has two wires coming out of it (Positive / 12v & ground.)

If the fan goes out on that unit, you'll just have to find a fan with similar specs, and take the 2pin connector off of the dead fan, and re-pin the new fan, attaching it to the 2pin connector and then replacing it on the housing.
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Old 04-09-2012
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In most cases, the voltage supplied to the fan is controlled by a temperature-to-voltage converter circuit inside the PSU, and the fan is just a standard 2-pin 12V DC type.
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