Articles: Cooling

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Cooling Efficiency Tests

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

With only one default cooling fan the new Scythe cooler turned out as efficient as Thermalright True Spirit. Under peak load it yielded only 1°C at 1200 and 1400 RPM, while at lower fan speeds both these coolers proved equally efficient. The situation is the same in those test modes where we used alternative Thermalright fans. Unfortunately, for Mugen 3, it and True Spirit demonstrated identical efficiency. I said “unfortunately”, because True Spirit cooler is currently retailing for at least $15 less than Mugen 3 ($29.95 vs. $45.5), therefore, the choice in this case will be obvious. Besides, I also have to point out that the cooling efficiency of Mugen 3 doesn’t change too much when we add a second fan for air exhaust. M.A.P.S. technology does work well and indeed makes the cooler as independent of the number of fans and their rotation speed as possible.

During the maximum overclocking tests with Scythe Mugen 3 we discovered that our cooler can easily cope with a 6-core processor overclocked to 4450 MHz at 1.4625 V core voltage with only one default Scythe Slip Stream 120 fan rotating at 1550 RPM. The temperature of the hottest processor core in this case was 91°C:

One Scythe Slip Stream 120 (1550 RPM)

Two Thermalright TR-FDB (2040 RPM)

When we tested Mugen 3 with two Thermalright TR-FDB fans at their maximum rotation speed of 2040 RPM, we could push our overclocking success even higher: 4475 MHz at 1.46875 V Vcore and 89°C maximum temperature. These are very good results, if we do not take the noise into consideration at this point.

Now let’s sum up the results for Mugen 3 cooler in quiet mode and at maximum rotation speed of its default fan:

* - the peak temperature of the hottest CPU core is displayed on the diagram taking
into account the delta between the 25°C threshold and the current room temperature.

Now it is time to add the results of maximum CPU overclocking to our summary table for all tested cooling solutions. Besides the processor frequency, it also shows maximum temperature (again taking into account the difference in the ambient temperature) and the level of generated noise. Unlike the previous summary diagram, here all participants were tested in their default configurations (i.e. without any additional/replacement fans):

Scythe Mugen 3 maintains steady position in the very center of the pack. Its closest rivals are Thermalright HR-02 Macho (a little more efficient and much quieter) and Thermalright True Spirit (a little less efficient and noisy).

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