Testing Results, Maximum Fan Speed

Our maximum speed testing is performed with both the fans and the pump of the kit powered via a 12V DC source. This input voltage should have the pump and fans matching the speed ratings of the manufacturer. The Pure Wings fans rotate a tiny bit faster than their specifications suggest, with our tachometer reading 1610 RPM. There was no difference between the two fans, suggesting great quality control – at least amongst the few samples that we tested.

Average Thermal Resistance

Core Temperature, Constant Thermal Load (Max Fan Speed)

The thermal performance charts show that the 280 mm version of the Be Quiet! Pure Loop performs on par with other similarly-sized solutions, without any significant surprises. The average thermal resistance of 0.0805 °C/W is good for a cooler with two 140 mm fans, matching the performance of most 280 mm coolers that we have tested to this date.

Fan Speed (12 Volts)

Noise level

Although the Pure Loop 280 mm's thermals do not outperform most of the competition, it has a serious performance advantage comes to acoustics. With a reading of 37.9 dB(A), the 280 mm version of the Pure Loop is the quietest two-fan AIO cooler that we have ever tested. Still, 37.9 dB(A) is not an inaudible figure, so for users after especially quiet computing, they will probably not want to use their cooler at maximum speed for extended periods of time.

Testing Results, Low Fan Speed

Using a PWM voltage regulator, we reduced the speed of the fans manually down to half their rated speed, which is 800 RPM for the Pure Wings 140 mm fans. The pump was also connected to the same power source, functioning properly at this low-speed setting.

Average Thermal Resistance

Core Temperature, Constant Thermal Load (Low Fan Speed)

There are no significant changes in this test, with the Be Quiet! Pure Loop offering thermal performance analogous to that of other similar AIO coolers. It falls a little behind only when the load is very high, which harms the average thermal performance of the cooler a little, resulting in an average thermal permittance of 0.1066 °C/W. However, a closer look at the charts reveals that the Pure Loop performs admirably well when the thermal load is below 150 Watts under these operating conditions.

Fan Speed (7 Volts)

Noise level

Much like before, the amount of noise coming off of the Be Quiet! Pure Loop is exceptionally low. With a noise output of 32.3 dB(A), the 280 mm version of the Pure Loop lands a better acoustic performance than that of most AIO coolers – even those with a single cooling fan. Even in the quiet October night, it is nearly dead silent under these operating conditions, audible only when someone gets very close to the cooler and in a completely quiet room.

Thermal Resistance VS Sound Pressure Level

During our thermal resistance vs. sound pressure level test, we maintain a steady 100W thermal load and assess the overall performance of the coolers by taking multiple temperature and sound pressure level readings within the operating range of the stock cooling fans. The result is a graph that depicts the absolute thermal resistance of the cooler in comparison to the noise generated. For both the sound pressure level and absolute thermal resistance readings, lower figures are better.

The graph reveals that the overall performance of the Be Quiet! Pure Loop 280 mm cooler falls between that of other similarly sized coolers. It generally is a little worse than the SilverStone Icegem 280 but a little better than the NZXT Z63 – a major win for Be Quiet!, considering the retail price of their cooler. However, from the graph, we can also see that the Be Quiet! Pure Loop 280 cannot reach very low thermal resistance figures regardless of its operating conditions, suggesting that it might not be an ideal solution for systems that may face extremely high thermal loads, even if only temporarily.

Testing Methodology Final Words & Conclusion
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  • Flunk - Thursday, October 14, 2021 - link

    It would have been nice to see a high-end air cooler in the results, such as a Be Quiet Dark Rock Pro 4, to compare the difference between high-end air and AIOs. Many people cross-shop air coolers and AIOs and without at least one comparison point it's hard to know how they stack up.
  • satai - Thursday, October 14, 2021 - link

    I would be quite interested how this compares with higher Noctua models too.
  • vanish1 - Thursday, October 14, 2021 - link

    Their bench page has air cooler results. You should try looking first instead of crying that the info isnt being spoon fed into your mouth, baby.
  • Slash3 - Thursday, October 14, 2021 - link

    You should probably read the review first before commenting.
  • vanish1 - Thursday, October 14, 2021 - link

    You're an idiot. Anandtech has it's own bench page with a backlog of testing results that anyone can access at the top of the site where it says "BENCH"

    You can go back to the peanut gallery now.
  • Slash3 - Thursday, October 14, 2021 - link

    Reading comprehension is important. Keep at it though, you'll get there eventually.

    Flunk wrote "It would have been nice to see a high-end air cooler in the results."

    If you can't tell the difference between the aggregation database and results in a directly referenced review, I don't know if there's much hope left for this conversation.

    I feel it's important to also point out that the referenced Be Quiet Pure Loop 280, the Dark Rock Pro 4 or the common Noctua NH-D15 are all entirely absent from the Bench database. Oops. You'd know this though, because you checked it. Right?


    Consider breathing exercises, or yoga. You seem to need some help with focusing your attention.
  • vanish1 - Thursday, October 14, 2021 - link

    NH-D15 is just an updated NH-D14 and congratulations you picked one cooler that wasnt there, make sure to hold on to that one cooler tight so you get to say you are not wrong like a bit.ch

    There is a bench full of air coolers, if you're stupid enough that you need every piece of information spoon fed to you and you cant figure out anything on your own, stick to tomshardware
  • sor - Thursday, October 14, 2021 - link

    It’s not as much what you say as how you say it. It’s possible to politely point out that the info might be available, it doesn’t require someone to make an ass of themselves.

    It’s also totally valid to suggest that extremely relevant information be collected into an article. It would make the article itself better.
  • Oxford Guy - Friday, October 15, 2021 - link

    'you picked one cooler that wasnt there'

    Only the industry standard in high-end air cooling. Nothing important there!
  • milleron - Wednesday, November 17, 2021 - link

    Dear Mr. Vanish, you have a serious problem. I think you can be helped with drugs and psychotherapy, but it'll require knowledgable and dedicated psychiatrists and psychopharmacologists. Meanwhile, I'd stay out of bars if I were you; with your present approach to life, you probably would not get out of one with all your teeth.

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