The heat output from Intel processors varies widely between single and multi-core processors, so we've settled on two values which represent the upper limit (150W and 85W) of both existing CPU families.
With a 150W heat load applied by the Intel LGA775 version of FrostyTech's synthetic thermal test platform, the Zalman CNPS9700 LED heatsink maintains a excellent rise above ambient temperature of just 19.0°C! For this thermal result, there was 56.5 dBA noise from the 110mm fan spinning at its full speed of 2800RPM. The CPU equivalents of this test would be an Intel Pentium D / Extreme Edition or Core 2 Quad class chip. At the much quieter fan speed of 1250RPM, temperatures rise by only a few degrees to 25.2°C (37.5 dBA) over ambient.
The Zalman CNPS9700 LED heatsink was next tested with the reduced heat load of 85W. In this case the heatsink produced a 10.4°C rise over ambient at full fan speed. When the fan speed is once again reduced to quiet mode (1250RPM), the CNPS9700 LED heatsink achieves a temperature of 15.7°C over ambient.
Bottom Line - Quiet & Cool!
At stock fan speeds, the Zalman CNPS9700 LED heatsink is one of the best socket 775 Intel Pentium & Core 2 Duo heatsinks FrostyTech has tested to date. When running in its quiet 37.5 dBA mode, the Zalman CNPS9700 LED operates only 5°C warmer, again giving it the distinction of top of the line quiet socket 775 operation.
The results of Frostytech's tests with the Zalman CNPS9700 LED underscore its capabilities as an excellent low noise thermal solution. This is one heatsink that operates best when the fan is running at its slowest speed and generating barely any noise at all.
From the results listed above, it's clear that the Zalman CNPS9700 LED is all around one of the best multi-CPU heatsinks on the market at this time, handling AMD and Intel thermal loads with equal grace (at full fan speed). When used in its quietest mode, the Zalman CNPS9700 LED is demonstrably better than the stock Intel Pentium D, and stock socket AM2 AMD heatsinks. The competition is a little fiercer on the socket 939/AM2 synthetic thermal test platform, perhaps indicating the CNPS9700 LED has been tuned more for Intel processors... Either way, the Zalman CNPS9700 LED is so good at what it does that it's the only Zalman heatsink you should be considering for your processor right now. Performance cooling and quiet performance cooling all in one package, impressive!
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