be quiet! Pure Loop 280 mm Liquid CPU Cooler Review

Manufacturer: be quiet! be quiet! Pure Loop 280 mm Liquid CPU Cooler Review

Adding to the ever-growing collection of CPU cooling options from be quiet! is the new Pure Loop, a line of AiO liquid coolers available in sizes ranging from 120 mm to 360 mm that are reasonably priced – from $84.90 – $119.90 USD depending on size.

A true AiO (all-in-one) liquid cooler rather than a CLC (closed-loop cooler) thanks to a handy fill port, the Pure Loop offers an interesting take on the concept with a pump assembly located inline on the hoses, rather than the block assembly.

Obviously companies must be creative to avoid infringing on Asetek patents, and the performance from this inline pump design will be interesting to examine. Another aspect of the design is the low-key white LED lighting, with no RGBs in sight.

Features from be quiet! For the Pure Loop series:

  • Silent and Reliable Cooling: Pure Loop water cooling units have a doubly decoupled pump to guarantee minimal vibration. Up to three Pure Wings 2 fans feature nine airflow-optimized fan blades that ensure a perfect cooling airflow and very quiet operation
  • Eye-Catching: The all-black design guarantees the Pure Loop to look stunning in every PC case. The white LED on the cooling block underlines the stylish claim
  • Easy and Convenient Handling: An easy-to-access refill port simplifies the refilling process and makes handling very convenient Flexible sleeved tubes guarantee a simple mounting
  • Outstanding Service and Support: 3-year manufacturer’s warranty. Product conception, design and quality control in Germany
Product Specifications
  • Radiator material: Aluminum 
  • Radiator Finish: Black spray painted
  • Refill port: Yes
  • Base material: Copper
  • Base Finish: Nickel plated
  • Pump Speed: 5500 RPM
  • Pump Connector: 3-pin
  • Tube Length: 400 mm
  • Fans
    • Model: Pure Wings 2 140mm PWM high-speed (x2)
    • Fan dimensions: 140 x 140 x 25 mm
    • Speed @ 100%: 1600 RPM
    • Bearing technology: Rifle
    • Motor technology: 4-pole fan motor
    • Rated Voltage: 12V
    • Input current: 0.50A
    • Input power: 6.0W
    • Connector: 4-pin PWM
  • Socket compatibility:
    • Intel 1200 / 2066 / 1150 / 1151 / 1155 / 2011(-3) square ILM
    • AMD: AM4 / AM3(+)
  • Product Dimensions, incl. fans (HxWxD) 317 x 140 x 52 mm
  • Total weight: 1.22 kg

$104.90 USD

Manufacturer Description

“Pure Loop 280mm is the new impressively high-performing and silent All-in-One water cooling unit of be quiet! for price-conscious users with overclocked systems.”

Cooler Design

While adhering to a conventional all-in-one loop concept, the Pure Loop 280 mm offers a couple of key points of differentiation – which we will get to in a moment.

be quiet! Pure Loop 280 mm Liquid CPU Cooler Review - Cases and Cooling 15

The CPU block offers a nice brushed aluminum look with a simple be quiet! logo and subtle illumination via a white LED ring – there are no RGB effects.

The base of the cooler is copper with a nickel finish, and it appears nicely milled for a flat mating surface.

be quiet! Pure Loop 280 mm Liquid CPU Cooler Review - Cases and Cooling 16

We received the 280 mm version, and the radiator is of the usual aluminum variety with a black finish.

be quiet! Pure Loop 280 mm Liquid CPU Cooler Review - Cases and Cooling 17

And now for the first differentiation point, as the radiator includes a fill port along one side – no closed loop here.

be quiet! Pure Loop 280 mm Liquid CPU Cooler Review - Cases and Cooling 18

be quiet! includes 100 ml of coolant to top off the cooler and keep it performing like new, and you shouldn’t have to use for the first couple of years. We’ve seen coolant bottles like this included with Enermax designs before, and it’s good to see be quiet! offering a cooler that can be maintained easily.

Next we have the biggest differentiation point: the pump!

be quiet! Pure Loop 280 mm Liquid CPU Cooler Review - Cases and Cooling 19

Yes, that is the pump, suspended inline on the hoses just below the radiator. be quiet! calls this a “doubly decoupled pump” design, and says this implementation offers “quiet operation and minimal vibration”. It certainly is interesting to think of the vibration resistance of such a suspension, as of course typical Asetek designs place the pump above the cold plate.

Update – 10/15/20: I have been informed that a similar intra-hose pump assembly can be found from Enermax with their LIQFUSION and RAIJINTEK with their ORCUS liquid coolers. I have not been following the AiO industry closely enough, apparently!


Because I’m a practical (read: boring) person, I chose to install the Pure Loop cooler on the same Intel Z490/i9-10900K platform used for other recent liquid cooler reviews – a choice which will certainly go over well with AMD Ryzen enthusiasts. Why do this? For that sweet unlimited 200W CPU power draw!

The above nonsense aside, the Pure Loop includes everything you need to mount to Intel or AMD desktop systems (no Threadripper support), and I found the hardware kit to be above average (I find things like the rubber rings that hold the retention bolts in place on the base plate to constitute “above average”).

Needless to say, the cooler installation was a snap, and the mount offers quite a bit of mounting pressure – which bodes well for results from the toasty i9-10900K beneath.

Thermal and Noise Performance

PC Perspective Cooler Test Platform
Motherboard ASRock Z490 Taichi
Memory Corsair Vengeance LPX 16GB (2x8GB)
GPU Palit GeForce GTX 1050 Ti KalmX (Fanless)
Storage Corsair Neutron Series XTi 480GB
Power Supply Fractal Ion+ 760W Platinum (zero-RPM mode)
Operating System Windows 10 64-bit

Attached to our Intel Z490 test platform with its Core i9-10900K processor – and with the motherboard configured to ignore CPU power limits and use a “standard” fan profile – we got started on some benchmarking.

Before looking at the performance comparison with other coolers, here’s a look at the result from a blender workload, with data recorded via HWINFO64 during a Blender Classroom CPU cycles render:

be quiet! Pure Loop 280 mm Liquid CPU Cooler Review - Cases and Cooling 24

Max temp in a ~21.5 °C room was 77 °C, which is an excellent result. Another sign of efficient cooling is what I like to think of as the “round trip” from ambient to load, and back again. Notice from the chart how quickly the cooler returns to essentially pre-load temps (in this case it started as 26-27 °C, and ended up at 28-30 °C after the benchmark).

And now for another look at this result with the CPU power draw added in:

be quiet! Pure Loop 280 mm Liquid CPU Cooler Review - Cases and Cooling 25

When you see power draw consistently above 200W – even approaching 220W at times – from the Core i9-10900K in its unlimited state (which is the default situation for every Z490 board I’ve tested so far) you might appreciate that 77 °C result a little bit more.

And now for some context, with the charts to follow adding results from this test configuration – with the exact same i9-10900K with no power limits enforced.

be quiet! Pure Loop 280 mm Liquid CPU Cooler Review - Cases and Cooling 26

The 280 mm version of the be quiet! Pure Loop tested very well, finishing between the H115i RGB Platinum and Gamer Storm Castle 280EX – an effective tie when a realistic +/- 1°C margin of error is factored in. Results in the delta 55-56°C range like this are outstanding – but how were noise levels?

be quiet! Pure Loop 280 mm Liquid CPU Cooler Review - Cases and Cooling 27

Here the Pure Loop finishes in second place in the group, but with load temps 10 dBA above the H115i “Balanced” preset results it’s not particularly quiet – when the fans are allowed to spin up to 100%, anyhow. Those impressive Corsair numbers did come with a restricted RPM fan profile, which also resulted in the highest temps in this group.

At full speed (1600 RPM) the Pure Wings 2 140mm PWM high-speed fans produce quite a bit of wind noise through the radiator, and with some fan curve tweaking the Pure Loop could be a lot more quiet than 44.8 dBA – though temps would be higher, naturally.


With the Pure Loop be quiet! has produced a solid liquid CPU cooler to compliment their lineup of air coolers, entering the market with some very reasonable prices. Fans can get a little noisy at full speed, but that can be controlled with fan curves if it’s a problem.

be quiet! Pure Loop 280 mm Liquid CPU Cooler Review - Cases and Cooling 28

List pricing for the 280 mm version we reviewed is $104.90 USD, making it one of the most affordable “name-brand” options on the market. And be quiet! is giving these Pure Loop coolers a 3-year warranty, which – along with the refill port and included coolant – suggests that these could end up being a reliable option down the road.

Bottom line: the be quiet! Pure Loop 280 mm liquid cooler we tested looks great, cools very well, and offers excellent value. Recommended.

pcper gold award

Review Disclosures

This disclosure statement covers the way the product being reviewed was obtained and the relationship between the product's manufacturer and PC Perspective.

How Product Was Obtained

The cooler is on loan from be quiet! for the purpose of this review.

What Happens To Product After Review

The cooler remains the property of be quiet! but will be on extended loan to PC Perspective for the purpose of future testing and product comparisons.

Company Involvement

be quiet! provided the product sample and technical brief to PC Perspective but had no control over the content of the review and was not consulted prior to publication.

PC Perspective Compensation

Neither PC Perspective nor any of its staff were paid or compensated in any way by be quiet! for this review.

Advertising Disclosure

be quiet! has purchased advertising at PC Perspective during the past twelve months.

Affiliate Links

This article contains affiliate links to online retailers. PC Perspective may receive compensation for purchases made through those links.

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About The Author

Sebastian Peak

Editor-in-Chief at PC Perspective. Writer of computer stuff, vintage PC nerd, and full-time dad. Still in search of the perfect smartphone. In his nonexistent spare time Sebastian's hobbies include hi-fi audio, guitars, and road bikes. Currently investigating time travel.


  1. Adam Carpentieri

    Looks like the temperature of the cooling liquid was still heating up (slight upward slope during the benchmark) before you stopped the high load activity. Would be interesting to see where it actually leveled off. And of course that would depend on conditions insides the room you were testing in.

    • Sebastian Peak

      Very true – in his video review Wendell fully saturates the loop by running Prime95 for hours… I hadn’t done that for the other coolers so this is just a direct comparison of Blender workloads.

  2. Pholostan

    *looking at the thermal paste application*

    I’m judging you Sebastian! Don’t think you can hide!

    And it’s fine.

    • Sebastian Peak

      You are right to judge. I don’t hide thermal paste, and I am prepared to be judged for that – and pump tube orientation, and whatever else I’ve been doing wrong for years. (My excuse is that the piece of cardstock I grabbed from the recycle bin had a slightly rough edge – normally I have the application looking very smooth.)


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