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Cooling Efficiency

The results of our comparative testing and a table with the detailed temperature readings are given below:

Click to enlarge

As w see, CoolIT ECO A.L.C.  with a single default fan working in quiet mode at 1000 RPM loses about 7°C under peak load to a common inexpensive air cooler with a default fan working at 1050 RPM. I have to say that this is a pretty sad result. However, if you switch the CoolIT ECO A.L.C. fan into the PWM mode, when according to monitoring utilities its rotation speed varies between 770 and 1830 RPM, then the cooling efficiency of this system increases dramatically and it can compete successfully against Cooler Master Hyper 212 Plus in PWM mode. Certainly, this isn’t something remarkable, but a 13-degree difference in maximum CPU temperature between the quiet mode and maximum fan rotation speed indicates that the efficiency of CoolIT ECO A.L.C. depends a lot on the quality of radiator ventilation. It is absolutely logical, because the radiator is fairly small and made of aluminum, so it was perfectly clear right from the start that the cooling efficiency of this system will be highly dependent on the radiator cooling.

The same can be concluded from the tests performed on CoolIT ECO A.L.C. with two fans. Look: by adding a second fan for air intake the maximum processor temperature in quiet mode at 1000 RPM becomes 3°C lower than with a single default fan at its maximum speed and 5°C lower than by Cooler Master Hyper 212 Plus with two quiet fans. And if you speed up the fans to 1830 RPM, then the maximum CPU temperature will drop by another 6°C. Well, looks like we are getting somewhere now.

Of course, it is expected that a liquid-cooling system for $74.99 will easily outperform a 29-dollar air-cooler. Although e could only do it with a second fan installed, we have to be fair to CoolIT ECO A.L.C. and check how far we can overclock our processor when this system is equipped with two cooling fans:


CoolIT ECO A.L.C (2x1000 RPM)


CoolIT ECO A.L.C (2x1860 RPM)

In both modes: quiet mode as well as at maximum fan rotation speed our quad-core Intel Core i7 could hit as high as 3.99 GHz at 1.6875 V Vcore. At 1000 RPM maximum processor temperature reached 84°C, and at 1830 RPM - 79°C. The CPU was overclocked almost to its maximum, but it is also very interesting to see how Noctua NH-D14 cooler copes with the same overclocking. Let’s see:


Noctua NH-D14 (2x800 RPM)


Noctua NH-D14 (2x1230 RPM)

Super-cooler with two 140 mm fans at 800 RPM doesn’t let the CPU temperature rise beyond 78°C, and at 1230 RPM – beyond 74°C.

The noise from the default fan of CoolIT ECO A.L.C. system doesn’t really stand out among other 120 mm fans. It is subjectively low at 850 RPM or less, subjectively comfortable at up to 1050 RPM and pretty loud at the maximum speed of 1830 RPM. As for the pump, it is extremely quiet if not completely noiseless. You can only hear it if you bring your ear as close to the pump as possible. That is really great, I should say!

 
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