FrostyTech has reviewed the Cooljag CJC66IC-A Copper Pentium 4 Heatsink

The secret of the Cooljag CJC66IC-A heatsink does not reveal itself until the fans' intake air reaches elevated temperatures, and once that happens, the full speed of the fan kicks in and rapidly adds extra airflow to cool the copper skived fins below. With the aid of a thermistor sticking out the side of the fans' motor, the Everflow fan can ramp up in speed from a whisper-quiet 1300RPM to a rather loud 6000RPM. At full blast, vibration can start to be an issue. The fully copper skived heatsink features fins of 0.6mm thickness, on a 2mm pitch, but what really makes the CoolJag CJC66IC-A stand out is the copper base. Machined in four places are relief cuts which have removed a 17mm x 26mm swath in each of the four corners. The reason for this?

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