The Be Quiet! Silent Loop 2 AIO Cooler Review: Quiet and Unassuming
by E. Fylladitakis on September 7, 2023 9:30 AM ESTTesting Methodology
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.
<35dB(A) | Virtually inaudible |
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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mr2ns - Thursday, September 14, 2023 - link
I apologize; I'm not attempting to drag you in on the copy edit comments but just trying to point out that IF he was intending to reply to your analysis of the performance then he replied to the wrong posts. Then again, meaculpa has been around the Anandtech block more than a few times so that was probably unnecessary.back2future - Saturday, September 9, 2023 - link
1) mediocrity within a range of possible developments for cost or a price (not about technology for a 21. century level of 'heat dissipation')2) enthusiasts are developers who aim towards impossible setups without (necessarily) being backed with company infrastructures and doing with a limited budget (that's impressive, but getting harder with technology being more diverse and specialized development structures), getting towards lower noise than to be heard within a silent room running full spec or oc tasks could be a lower priority compared to limiting logics&sram&peripherals(&gpu) heat addition from its source (some of it will appear with photon switched transistors within circuits(?, 'fastest demonstrated all-optical switching signal is 900 attoseconds'), but 'enthusiasts' designing optical circuits(?), again a rare niche to meet and worth a price(?) )