GuidesWikiA Guide To CPU Cooler Noise Levels

A Guide To CPU Cooler Noise Levels

Learn how to measure cooler fan noise level, optimal noise levels for a fan, and how to reduce noise from your fans.

In the past few years, with CPUs becoming more powerful than ever, the use of expensive aftermarket coolers has also increased. An important factor when it comes to these CPU coolers is their noise level. To ensure your PC is running at its best, adjusting its speed to balance noise and level is necessary. So, this guide will teach you all about CPU cooler noise levels.

Key Takeaways

  • CPU cooler noise is measured in A-weighted decibels, also written as dBA or dB(A). Higher fan speeds mean more noise but also better performance.
  • To find your CPU cooler’s noise rating, refer to the manufacturer’s spec sheet for it. You can also measure the noise yourself with a dBA meter or an acoustic test chamber.
  • 15-30 dBA is generally the recommended noise rating for a CPU fan. The noise is hardly noticeable, and most CPU cooler fans’ rating is found in this range.
  • To reduce CPU cooler noise, keep it dust-free, improve airflow in your PC, or replace the fans with quieter ones. You can also try installing more fans, setting up fan curves, replacing the thermal paste, and decoupling the fans from resonators.

Basics Of Cooler Noise Levels

Here are some basics to keep in mind:

  • First off, noise is measured in A-weighted decibels, written as dBA or dB(A). It measures the relative loudness of sounds as perceived by the human ears.
  • As far as CPU coolers are concerned, the rating you read on specification pages is the noise produced at maximum fan speed, measured in RPM
  • Liquid coolers are generally quieter than air coolers since they have more area for heat dissipation and, often, more fans.
  • At high fan speeds, you get better cooling, but the fans are noisier – and vice versa.
  • The more fans your cooler has, the more noise is produced. But more fans mean you can run them at slower speeds and still get effective cooling.
  • The same applies to larger fans (they can produce the same performance at lower speeds). 
  • Lastly, noise level also varies in fans of the same size due to differences in the number and design of fan blades.

How To Measure Cooler Noise Level

Firstly, the best tool is your ears. You can get an idea of how much is too loud and how much is optimal by tuning the fan speeds and noting down the RPM using monitoring software like HWiNFO. You can also refer to the manufacturer’s specs sheet for the cooler to find the maximum noise rating, which the manufacturer tests.

Be quiet! air cooler
be quiet! Dark Rock Pro 4 CPU cooler (Image by Tech4Gamers)

The second option is using a dBA meter – but this isn’t completely accurate due to ambient noise and noise from other components (for example, the GPU). The best and most accurate (also the costliest) option is using an acoustic test chamber.

Related Read: AIO Vs Air Coolers

What Is A Good Noise Level?

Here’s a breakdown of the different CPU cooler noise levels, including the ideal level you should look for.

Low Noise Level (not recommended) Ideal Noise Level (recommended for most users) High Noise Level
(starts to get disruptive)
Less than 15 dBA
(for reference, normal breathing is around 15 decibels loud or less.)
15-30 dBA
(for reference, a whisper is approximately 30 decibels loud.)
30-45 dBA
(for reference, a library is about 40 decibels loud, and a standing fan is about 50 decibels loud.)

So, the recommended noise level is between 15 and 30 dBA. Most CPU cooler fans lie in the 20-35 dBA range, while the loudest fans are below the 45 dBA mark.

How To Reduce Fan Noise

There are various ways to reduce CPU cooler fan noise.

  • Maintenance: Make sure the fans remain clean and free of dust. Dust renders your fans ineffective and running faster to tackle the heat. 
  • Improve Case Airflow: It’s good to ensure optimal airflow in your case to dissipate air effectively, allowing your fans to run at quieter speeds.
    PC case with many fans
    The Origin Neuron PC has plenty of fans for good airflow (Image by Tech4Gamers)
  • Replace The Fans: Replace your fans with lower-RPM fans, such as the be quiet! Silent Wings Pro 4.
  • Install More Fans: You can also increase the number of fans on your cooler. CPU coolers with tall heatsinks can support up to three fans, and AIOs support 1 to 3 fans on either side of the radiator. 
  • Set Up Fan Curves: Fan curves allow you to configure your fans to change their speed based on the CPU temperature. This is necessary that your fans aren’t unnecessarily running at high speeds even when temperatures are under control.
    PC fan curves
    A fan curve configuration (Image by Tech4Gamers)
  • Decouple Your Cooler Fans: The vibration from your cooler’s fans can be amplified by the heatsink/radiator of the cooler and the case. Prevent this by padding them with anti-vibration screws or rubberized frames.
  • Replacing Thermal Paste: Depending on various factors (like your general usage of the PC), your thermal paste may dry out quicker than usual. So, try replacing it and ensure that the thermal paste is high quality and has high heat conductivity (at least 70W/mK).

Frequently Asked Questions

Is 30 dBA loud for a CPU cooler?

30 dBA of noise is quite noticeable but not disruptive. Most cooler fans are rated 35 dBA at the highest, and that’s at max RPM. If your CPU cooler is adequate for your CPU, then you generally won’t need to run it at maximum speed, even under loads.

What should I do if my CPU fan is running too loud?

If your CPU cooler is making too much noise at idle, try setting up fan curves. If the problem is occurring under loads, try replacing the thermal paste, getting quieter fans, or just increasing the number of fans.

How much dBA is too loud for a CPU fan?

Generally, anything louder than 30 dBA starts to become disruptive in a quiet room.

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