The AlphaCool Eisbaer Aurora 360 AIO Cooler Review: Improving on Expandable CPU Coolingby E. Fylladitakis on August 11, 2022 8:00 AM EST
Although the testing of a cooler appears to be a simple task, that could not be much further from the truth. Proper thermal testing cannot be performed with a cooler mounted on a single chip, for multiple reasons. Some of these reasons include the instability of the thermal load and the inability to fully control and or monitor it, as well as the inaccuracy of the chip-integrated sensors. It is also impossible to compare results taken on different chips, let alone entirely different systems, which is a great problem when testing computer coolers, as the hardware changes every several months. Finally, testing a cooler on a typical system prevents the tester from assessing the most vital characteristic of a cooler, its absolute thermal resistance.
The absolute thermal resistance defines the absolute performance of a heatsink by indicating the temperature rise per unit of power, in our case in degrees Celsius per Watt (°C/W). In layman's terms, if the thermal resistance of a heatsink is known, the user can assess the highest possible temperature rise of a chip over ambient by simply multiplying the maximum thermal design power (TDP) rating of the chip with it. Extracting the absolute thermal resistance of a cooler however is no simple task, as the load has to be perfectly even, steady and variable, as the thermal resistance also varies depending on the magnitude of the thermal load. Therefore, even if it would be possible to assess the thermal resistance of a cooler while it is mounted on a working chip, it would not suffice, as a large change of the thermal load can yield much different results.
Appropriate thermal testing requires the creation of a proper testing station and the use of laboratory-grade equipment. Therefore, we created a thermal testing platform with a fully controllable thermal energy source that may be used to test any kind of cooler, regardless of its design and or compatibility. The thermal cartridge inside the core of our testing station can have its power adjusted between 60 W and 340 W, in 2 W increments (and it never throttles). Furthermore, monitoring and logging of the testing process via software minimizes the possibility of human errors during testing. A multifunction data acquisition module (DAQ) is responsible for the automatic or the manual control of the testing equipment, the acquisition of the ambient and the in-core temperatures via PT100 sensors, the logging of the test results and the mathematical extraction of performance figures.
Finally, as noise measurements are a bit tricky, their measurement is being performed manually. Fans can have significant variations in speed from their rated values, thus their actual speed during the thermal testing is being recorded via a laser tachometer. The fans (and pumps, when applicable) are being powered via an adjustable, fanless desktop DC power supply and noise measurements are being taken 1 meter away from the cooler, in a straight line ahead from its fan engine. At this point we should also note that the Decibel scale is logarithmic, which means that roughly every 3 dB(A) the sound pressure doubles. Therefore, the difference of sound pressure between 30 dB(A) and 60 dB(A) is not "twice as much" but nearly a thousand times greater. The table below should help you cross-reference our test results with real-life situations.
The noise floor of our recording equipment is 30.2-30.4 dB(A), which represents a medium-sized room without any active noise sources. All of our acoustic testing takes place during night hours, minimizing the possibility of external disruptions.
|35-38dB(A)||Very quiet (whisper-slight humming)|
|38-40dB(A)||Quiet (relatively comfortable - humming)|
|40-44dB(A)||Normal (humming noise, above comfortable for a large % of users)|
|44-47dB(A)*||Loud* (strong aerodynamic noise)|
|47-50dB(A)||Very loud (strong whining noise)|
|50-54dB(A)||Extremely loud (painfully distracting for the vast majority of users)|
|>54dB(A)||Intolerable for home/office use, special applications only.|
*noise levels above this are not suggested for daily use
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alufan - Monday, August 22, 2022 - linkI started off many years ago with a Corsair AIO then gravitated to an Alphacool kit very similar to this about 3 years back which I expanded and played with until the pump reached its limit, am now on a full blown twin pump hardline loop with 2x 480s a couple of 360s and a 280 cooling GPU and CPU so these kits have a place for those who want to start along the path of custom loops however the performance is not really any better than your average AIO of a similar size.
dizzynosed - Tuesday, August 23, 2022 - linkI stay with air cooling. Don't have the nerves to fiddle with more equipment and problems than necessary.
Tom Sunday - Thursday, August 25, 2022 - linkYes indeed a 2-year warranty is simply not acceptable and especially for so-called German engineering. It having me think twice in even considering this type of Aurora model. There has always been the fear (warranted or not) that AIO’s have an eventual leak-ability, are harder to stay with, and thus many continue in favoring simpler to ‘install and forget’ air-cooling. Besides AIO OEMs have been know to increase their profits by supplying cheap fans. I would also suggest that generally any ;expandable; AIO products present a relatively small market segment almost to a degree where its manufacturing challenges profitability.