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Cooling Efficiency Tests

First let me say a few words about the cooling efficiency of the junior Auras model – Shagon ARC-118. The thing is that it could properly cool our six-core processor only in nominal mode, i.e. at 3.33 GHz frequency and 1.2125 V Vcore:


Shagon ARC-118 (1000 RPM)

Shagon ARC-118 (1800 RPM)

As we see, in quiet mode at 1000 RPM the CPU temperature reached 80°C, and at maximum rotation speed of 1800 RPM for our Deep Cool UF92 fan it dropped down to 72°C. When we tried to overclock our processor even to the very modest 3.8 GHz without even touching its core voltage, Auras Shagon ARC-118 failed to ensure processor stability and maintain its temperature at least within 95°C. It could be caused by uneven base surface and therefore poor contact between the cooler base and the CPU heat-spreader, but even when we turned the cooler by 90 degrees on the CPU things didn’t get any better. Therefore, for the sake of more or less meaningful comparison we had to test the top AHC-118 model also at the nominal CPU speed:


Shagon AHC-118 (1000 RPM)

Shagon AHC-118 (1800 RPM)

It turned out that the junior model yields 22°C to the flagship product in quiet mode and 17°C at maximum fan speed. But even at this point we can’t praise the gigantic Shagon AHC-118, because it is not that this cooler turned out so great, but because the junior cooler model didn’t turn out too bad after all.

 To confirm this, we performed some maximum overclocking tests with our processor and Shagon AHC-118. We discovered that at 1000 RPM this cooler can cope with a six-core processor overclocked to 4.2 GHz at 1.35 V Vcore and maintain its temperature at 95°C. As you see, it is right at the very maximum. And all that was achieved with the removed side panel of our system case! As the nominal 120 mm fan of our Shagon AHC-118 sped up to the maximum 1800 RPM, the CPU temperature dropped to 91°C, which is not a too remarkable achievement during such overclocking.

Compared with the modest Cooler Master Hyper 212 Plus, which costs $20 less, Shagon AHC-118 suffers a complete defeat:

A more powerful 140 mm Scythe Slip Stream 140 fan on the larger Auras heatsink helped lower the temperature of the hottest CPU core only by 2 degrees under maximum load:


Shagon AHC-118 @ 1740 RPM (Scythe 140 fan)

Even in this mode Shagon AHC-118 falls behind Cooler Master Hyper 212 Plus with a default fan.

Conclusion

Unfortunately, new Auras coolers didn't turn out very successful or very efficient models. They simply do not work the way systems with such design, size and price should work. First of all, it is about the top model, Shagon AHC-118, which is too tall and will only fit in a few selected cases, but nevertheless, it loses to a medium-sized and relatively inexpensive Cooler Master Hyper 212 Plus with a default fan. As we have seen during our test session, an alternative more powerful 140 mm fan barely fixes things for Auras, so the primary reason for such poor results is most likely the defective heatpipes or the contact between the heatpipes and the heatsink plates. These are the only two issues we could think of concerning the design of the Shagon AHC-118 (and ARC-118) coolers with Direct-Contact technology. Of course, we should also keep in mind that our particular ARC-118 sample has a very uneven base.

Among definite advantages, we must point out that both coolers are universal, very easy to install and have very reliable retention with high pressure hold. Besides, the 120 mm default fan of the Shagon AHC-118 cooler can be considered acoustically comfortable (in our subjective opinion) at 1100 RPM speed.

 
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