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Cooling Efficiency and Acoustic Performance

During this test session we managed to overclock our 45nm quad-core processor quite well even at the lower fans rotation speeds. We reached 3.95 GHz (+48.1%). The nominal processor Vcore was increased to 1.34375V in the mainboard BIOS (+12%):

During CPU overclocking we activated in the mainboard BIOS the “Load-Line Calibration” function that lowers the voltage drop on the part of the voltage regulator circuitry before the CPU. The system memory voltage was locked at 1.64V and its frequency was at 1528MHz (7-7-7-14_1T timings). All other parameters available in the mainboard BIOS and connected with CPU or memory overclocking remained unchanged (set to Auto).

Before we get to discussing the obtained results, we have to say a few words about the default AVC cooler fan. When we connected it to the mainboard, its rotation speed changed automatically in the interval from 1390RPM to 1960RPM. In other words, the rotation speed never lowered down to 550RPM claimed by the spec (even in Silent mode set through the mainboard BIOS). Of course, no silent mode was possible at 1360RPM. We tried adjusting the rotation speed of this fan with Zalman ZM-MFC2 panel, but with no luck, because the strange AVC fan was still rotating with variable speed, no matter what we set. When we compared the cooler efficiency with the default fan settings, fan rotating at 1390-2000RPM and an alternative Noisevlocker fan at 1980RPM, we obtained identical results under peak load. Therefore, we decided to perform the main test session only with the Noiseblocker fan.

Here are the obtained results:

Frankly speaking, I didn’t expect AVC Extra-sensory perception Integrating to do so well. Although its ability to cool a well-overclocked quad-core processor even at minimal fan rotation speed gave us good reasons to expect more. And when we completed the tests of the Thermalright IFX-14 competitor, AVC once again proved how extremely efficient it was. If you remember our latest massive super-cooler shootout, you can easily conclude that if AVC had participated in that test session, it would undoubtedly have taken the silver in cooling efficiency, because all the testing participants in that session fell 5°C+ behind IFX-14, while AVC only lost 3°C to the leader.

Don’t think that I am trying to mislead you, because if I had installed a second or even third fan onto Thermalright IFX-14, then the efficiency difference would have increased to 5°C or even 7°C. But, it is not what I am talking about here. It is important, that we compared two coolers in identical testing conditions and equipped with the same fan. In other words, it means that the heatsink of AVC Extra-sensory perception Integrating cooler is just a little bit less efficient than the competitor’s one. And this is all despite the fact that the AVC cooler uses four 6-mm heatpipes, while IFX-14 – six 8-mm heatpipes, and the heatsink effective surface is 18% by Thermalright solution. Taking all these facts into account we have every reason to state that AVC Extra-sensory perception Integrating demonstrated truly remarkable cooling efficiency.

When we measured the noise from the AVC cooler fan at its minimal rotation speed (during the tests) of 1360RPM at 1m distance we got 35.7dBA and at 3m – 32.3dBA. At the Maximum fan rotation speed of 1960RPM the fan generated 42.2 and 36.7dBA respectively.  In other words, it is far not the quietest fan, although its PWM module may work differently on your specific mainboard. I also have to add that at 1360RPM we could clearly hear some crackling inside the fan bearing. Together with its indistinct rotation adjustment mechanism, this could be considered one and only drawback of our today’s hero.

 
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