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Cooling Efficiency

The results of our cooling efficiency tests are given on the following diagram and in the following table:

First let’s discuss the results obtained with the default fans. Deepcool GAMMAXX 400 didn’t demonstrate any superb cooling efficiency and at 800 RPM fan speed it barely coped with a slightly overclocked processor. As we increase the fan speed in 200 RPM increments up to the maximum of 1460 RPM, the cooler efficiency increases almost linearly by 3-4°C with the peak CPU temperature dropping overall by 10°C. Nevertheless, at its maximum fan rotation speed Deepcool GAMMAXX 400 barely catches up with the competitor, Cooler Master Hyper PWM 412 at 800 RPM. The latter, however, looks very good against the background of the absolute leader in this price segment – Thermalright TRUE Spirit 140. Cooler Master only falls 1-3°C behind the Thermalright cooler and at the maximum rotation speed of its default fan it proves to be just as efficient as the Thermalright cooler. However, as you probably understood, these results do not take into account the level of generated noise.

When we run the tests with two Thermalright TR-FDB fans on Hyper PWM 412 and GAMMAXX 400 heatsinks and two TY-140 fans on the TRU Spirit 140, the overall ranking of the coolers remains unchanged. Deepcool GAMMAXX 400 is still the least efficient of the three, although with two alternative fans its cooling efficiency did improve by 4°C in quiet mode and by 2°C at maximum fan speed. The cooling efficiency of Cooler Master Hyper PWM 412 also got 2-4°C better, although Thermalright TRUE Spirit 140 didn’t give in and remained the leader of our today’s test session. So far there is no other sub-$45 cooler that could outdo the Thermalright product in efficiency and acoustics.

You can compare the results of our today’s testing participants against the previously tested products in the following table and diagram*. Each cooler was tested in its default configuration in the quiet mode and at the maximum speed of the fan(s) with the CPU overclocked to 4.375 MHz at 1.385 V Vcore.

* - 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 reduced to 25°C.

Cooler Master Hyper PWM 412 at the maximum fan speed managed to secure a spot closer to the top of the list and to outperform some more expensive products. In quiet more, when the fan rotates at 800 RPM, the Cooler Master product also performs quite well and positions between Thermalright HR-02 Macho (800 RPM) and Thermalright Archon SB-E (700 RPM). Deepcool GAMMAXX 400, on the contrary, is as efficient as the same Macho cooler at 800 RPM, only Deepcool product has to maintain the maximum RPM level of its 140 mm fan. And if we take into account the level of generated noise, which we are going to discuss a later in this review, it loses to all other coolers in the lower-end group.

Unfortunately, it was impossible to further overclock our processor under Hyper PWM 412, although Cooler Master did its absolute best to succeed:


Of course, further CPU overclocking under Deepcool GAMMAXX 400 was definitely out of the question that is why the table and diagram with our maximum overclocking results look as follows:

Acoustic Performance

We measured the noise level of our coolers throughout the entire speed range of their fans, as described in the chapter on testing methodology. Here are the results:

I can’t say that the noise generated by Cooler Master Hyper PWM 412 and Deepcool GAMMAXX 400 at the same fan rotation speeds is very different. However, the former is a little quieter and remains subjectively comfortable up to 1060 RPM, while the latter only remains acoustically comfortable up to 1020 RPM. Both coolers have very high-quality default fans, which do not produce any beating or crackling noises in their entire rotation speed range. At the same time, they are still quite far behind Thermalright TRUE Spirit 140 in terms of acoustic performance.


New Cooler Master Hyper PWM 412 and Deepcool GAMMAXX 400 coolers proved to have a lot of similarities. They have similar design, number of heatpipes, dimensions and weight, compatibility with contemporary platforms, simple installation, price, warranty and even levels of generated noise. They seem to have only one difference, which is the most significant one - cooling efficiency. While Cooler Master Hyper PWM 412 with its enhanced Continuous Direct Contact technology demonstrated very high cooling efficiency on an overclocked six-core processor, the Deepcool GAMMAXX 400 didn’t impress us with its results, unfortunately. Even though it is $10 less expensive, it doesn’t justify its lower cooling efficiency. So, if you are choosing from these two models, then the decision is obvious - Cooler Master Hyper PWM 412, which becomes a very worthy option for those considering sub-$40 CPU coolers.

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