Globalwin CAK4-88T Copper Heatsink Review

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There are a few major heatsink manufacturers which produce the staples of the cooling world, and Globalwin is one of them. The CAK4-88T is an all copper skive heatsink with a thermally controlled 80mm fan for lower-noise sensitivity. When the heatsink is not very hot, the fan spins at a slower RPM which produces less noise. When the thermistor senses an increase in temperature, the fan speed kicks in to full RPM, and the heatsink receives an added boost necessary to keep temperatures under control.

Since the copper skive portion of the Globalwin CAK4-88T is just 70mm in size, Globalwin have added an 80mm-70mm fan adaptor to the package. The fan adaptor is made from translucent blue plastic and features an ingenious curved divider down the center.

Standing 18mm tall, the fan adaptor adds some height to the overall cooling package, but only marginally so.

	Heatsink Specsheet: Model Name: CAK4-88T Fan Specs: 2000-4000RPM, 38-45CFM, 12V, 0.40A. Fan Dim: 25x80x80mm Heatsink Dim: 87x70x70mm HS Material: Copper 1100, aluminum Mfg by: Globalwin USA Sold By: www.globalwinusa.com

Looking down onto the heatsink with the blue fan adaptor in place, the heatsink has a very nice appearance. The fan adaptor has once downside, and that revolves around the plastic itself. While reviewing the GlobalWin CAK4-88T and CAK4-76T we swapped out different fans several times and this caused cracks in the plastic around the screw holes.

Obviously, if the plastic which is supposed to be holding the fan in place fails, that poses a potential problem. A more flexible/durable plastic would be a good option to consider for Globalwin, or perhaps some material reinforcement around the screw holes to prevent cracking in the first place.

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 supposed to be 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.