Globalwin CAK4-76T Copper Heatsink Review
With a
thermistor controlled fan that ranges in noise from
about 37 dB - 45 dB, the Globalwin CAK4-76T is
one of the quieter heatsinks out on the market, but also one which will scale
its speed to meet the cooling requirements placed on it. As the
thermistor senses an increase in the temperature of the body of the heatsink it
will increase the fan speed to compensate. This technique has been used for quite some time on power supplies where it was effective at decreasing
the overall sound output of a computer.
A processor is a little bit of
a different situation, but at least we are seeing Globalwin place the thermistor
on the end of a small wire, instead of just at the base of the fan's motor. When
installed properly, the thermistor should be able to sense the temperature at
the base of the heatsink and adjust fan RPM to compensate. If the thermistor
were at the base of the motor, it would be sensing already very warm fins before
kicking in the extra power to keep the fan up to speed.
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| Heatsink Specsheet: |
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- Model Name: CAK4-76T
- Fan Specs: 4000RPM, 12V, 0.20A.
- Fan Dim: 15x70x70mm
- Heatsink Dim: 59x69x70mm
- HS Material: Skived Copper 1100, Aluminum
- Mfg by: Globalwin USA
Sold By: www.globalwinusa.com
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The clear plastic fan you see
below has a small thermistor at the end of a
wire coming from the motor housing. When the fan is installed on the rest of
the heatsink this thermistor is positioned in between two of the copper fins, or between
the copper fin and the aluminum frame.
In this way,
it is in direct contact with the metal and able to sense
temperature changes to effect an increase in fan RPM. The
RPM change is triggered between 30-38 degrees Celsius where fan RPM increases from 2800 to
4000RPM. In its' lowest state the fan is very quiet. When it kicks up to
full RPM, the noise levels become atypical.
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