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with a 150w heat load applied by the intel lga775 synthetic thermal test platform , the Apack Zerotherm CF900 heatsink achieves a very nice rise above ambient temperature of 32.9°C. The heatsink's 95mm fan was spinning at 2300RPM during these tests, and so it created about 48.3 dBA noise. Compared to the Intel Pentium D heatsink, the Apack Zerotherm CF900 operate less than a degree cooler under this thermal load. A heat load of 150W is roughly approximate to a stressed Intel Pentium D / Extreme Edition or Core 2 Quad class processor.
The Apack Zerotherm CF900 heatsink was next tested with an 85W heat load, where it maintained a 20.3°C rise over ambient. This is effectively the same as the stock Intel heatsink managed.
We've also included the synthetic temperature test results for the Apack Zerotherm CF900 heatsink with the 95mm fan rotating at its slowest speed. In actual use it would never maintain an 800RPM speed when the temperatures reach this level.
With its fan artificially forced to maintain a low speed of 800RPM the Apack Zerotherm CF900 heatsink operates silently at 34.7 dBA. The heatsink maintains a rise above ambient temperature of 67.4°C at 150W, and 39.2°C at the 85W heat load. At its lowest fan speed the stock Intel heatsink performs far and away better than this. Compared to the CF800 model, these temperatures are virtually the same, though at 85W the CF900 handles the heat somewhat better. To be clear though, the CF900 would not continue to maintain such a low fan speed under the aforementioned temperatures - we just wanted to see how it would react.
On the whole, Apack have managed to produce a heatsink which is effectively equivalent to the stock Intel Pentium D heatsink on the socket 775 platform. Between the all aluminum Apack Zerotherm CF800 and all copper Zerotherm CF900 there is less of a change. We would have expected the copper version to run a bit cooler at full fan speed, but the thermal test results are with a degree of each other when 150W of heat is applied. Bottom line, the Apack Zerotherm CF900 is a good heatsink, as good as the stock Pentium D cooler in fact.
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