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Cooling Efficiency Tests

The results of our cooling efficiency tests are summed up in the diagram and table below:

No wonder happened: Zalman CNPS11X Performa yielded to Thermalright HR-02 Macho in the entire operational range of its cooling fan. At the maximum speed of 1620 RPM the newcomer is just as efficient as Macho at 800-1000 RPM, which is, undoubtedly, a much quieter mode. At lower fan speeds CNPS11X Performa loses up to 6°C to Macho under peak load, but we can’t help mentioning that the cooling efficiency of the new Zalman cooler is not as sensitive to the rotation speed of its fan as the efficiency of other tower coolers or at least Zalman CNPS11X Extreme. At the same time, we should note that at 800 RPM of its default fan Zalman CNPS11X Performa copes just fine with an overclocked six-core CPU, which hottest core temperature never exceeded 88°C. It is a very good result, provided the cooler will be quiet at this fan speed.

During our maximum CPU overclocking tests under Zalman CNPS11X Performa we managed to maintain stability at up to 4.425 GHz frequency with 1.4375 V Vcore and 92°C peak temperature:

Zalman CNPS11X Performa (1620 RPM)

And this is what the new Zalman CNPS11X Performa looks like in our summary table and diagram*:

* - The peak temperature of the hottest CPU core is posted on the diagram
taking into account the difference from the current ambient temperature
and is brought down to 25°C.

It is remarkable that during such overclocking (4.3 GHz at 1.3875 V Vcore) the new Zalman cooler manages to pass its direct predecessor – Zalman CNPS10X Performa, at a lower fan speed and lower noise level. However, we shouldn’t forget that CNPS10X Performa can accommodate a second fan, while the CNPS11X Performa doesn’t allow it. Moreover, in our maximum CPU overclocking rating Zalman CNPS11X Performa comes after the 10th model:

Nevertheless, overclocking to 4.425 GHz at 1.4375 V core voltage is a good achievement for a cooler that weighs only 450 grams and costs only $39.

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