GuidesComparisons120mm vs 140mm Case Fans

120mm vs 140mm Case Fans [Full Comparison]

In our 120mm vs 140mm case fans guide, we are going to compare both of them to help you choose the right one for your case.

Expert Verified By

120mm AIO

Rated: 8.5/10

140mm AIO

Rated: 8/10

Pros And Cons

120mm AIO✅ Cheaper
✅ Runs Faster
❌ Makes more noise
280mm AIO✅ Higher Static Pressure
✅ Better cooling.
❌ Expensive
Key Takeaways
  • 120mm is much common fan size that can fit in most cases.
  • 120mm fans tend to be much cheaper compared to most 140mm fans.
  • 140mm fans tend to perform better than 120mm fans on average.
  • 140mm fans are also much quieter. However, they can only fit in certain casings.

Comparison Table

ModelDeepcool 140mm FanDeepcool 120mm Fan
Fan Dimensions140×140×25 mm120×120×25 mm
Fan Speed400~1600 RPM±10%500~1800 RPM±10%
Fan Airflow97.03 CFM69.34 CFM
Fan Air Pressure2.00 mmAq2.33 mmAq
Fan Noise≤39.8 dB(A)≤32 dB(A)
Fan Rated Voltage12 VDC12 VDC
Fan Rated Current0.3 A0.15 A
Fan Power Consumption3.6 W1.8 W
LED TypeAddressable RGB LEDAddressable RGB LED
LED Connector3-pin(+5V-D-G)3-pin(+5V-D-G)
LED Rated Voltage5 VDC5 VDC

Architectural Differences

  1. Cooling Efficiency: 140mm fans are expected to have an edge in terms of cooling efficiency, as they have a larger surface area to play around with.
  2. Fan Dimensions: 120mm fans generally have a length and width of 120mm, with a thickness of 25mm. Standard 140mm fans usually have a length and width of 140mm, with a thickness of 25mm. RGB fans tend to be a little thicker.
  3. Noise Levels: 140mm fans win in this regard, as they don’t need to run as fast as 120mm fans to provide adequate cooling, hence they run quieter.

When choosing a cooling solution for your PC, the dilemma you generally face is, what fan size should you go with? The two most common fan sizes available in the market are 120mm and 140mm fans. Today, we will be doing a battle between 120mm vs 140mm case fans. 

120mm Vs 140mm Case Fans Comparison

Let us compare the two most readily available fan sizes in a number of general categories and see which is better in each.

120mm Fan GAMDIAS AELOUS M2-1204R. Image Credits: Tech4Gamers
120mm Fan GAMDIAS AELOUS M2-1204R. Image Credits: Tech4Gamers

Cooling Performance

In terms of pure cooling performance, 140mm fans will always come up ahead if there are no external factors. This is simply because they occupy a considerable amount of space, which allows them to dissipate heat more efficiently. 

Most 140mm fans tend to dominate CFM ratings compared to 120mm fans, which is solely because of their greater surface area and longer blades. Long story short, 140mm fans will almost always perform better than 120mm in terms of cooling.


It is easy to recommend a 120mm fan because almost every casing in the world will support it. Whether it’s an HTPC case, a mini ITX, a micro ATX, or a full-sized ATX case, A 120mm fan will be compatible with all of them.

Many bigger-sized ATX and Micro ATX casings support 140mm fans since it’s usually gamers and enthusiasts that demand the cooling 140mm fans provide. For an average user, 120mm fans will do just fine.

Noise Levels

In this regard, 140mm comes the head of 120mm as it has been observed to stay quieter. This is because 140mm fans can run on a lower rpm than 120mm fans while maintaining better thermals.

They do not have to move as fast in order to maintain optimal airflow. Their superior fan blades can suck more air while running at lower speeds.

Fan Speed

120mm fans tend to be much faster than 140mm fans as they run at 1200 rpm compared to 1000 rpm on 140mm. However, the larger surface area and fan blades give 140mm fans an edge in cooling performance, as it does not need to spin as fast as a 120mm fan to dissipate heat and maintain optimal airflow.

140mm Fan DeepCool AS500 Plus <a class=
140mm Fan DeepCool AS500 PlusImage Credits: Tech4Gamers


If you are on a budget, then 120mm is easily the better option for you. It is the better value for the money because it can do most of what a 140mm fan does while costing less. A 140mm fan will always cost more compared to a 120mm fan. 

However, if you are not on a budget and you are someone who likes to constantly test the limit of their PC, then investing in the bigger 140mm fans is absolutely worth it. 

120mm Vs 140mm Case: Which One To Choose? 

120mm fans: One of the biggest and obvious benefits of going with a 120mm fan is its insane compatibility. Another benefit is that they are a better bang for the buck. They cost significantly less than the bigger 140mm fans, and anyone who is on a budget is advised to look for 120mm fans.

140mm fans: 140mm fans tend to be 15% bigger, on average. The bigger surface area allows them to dissipate more heat and ensure a better airflow inside your case. Another reason one might prefer 140mm fans over 120mm is that they run comparatively quieter.  

120mm is a much more compact size that will fit most cases. These fans are also cheaper and have better value for the money. 140mm fans are larger than 120mm fans. Due to them being large, they are considerably better at cooling as well. They also manage to stay quiet.


Do 120mm fans provide sufficient cooling?

That depends on your workload. If you are a casual gamer who does not overclock their CPU and GPU, 120mm fans will suffice.

Which fans should I get if I want a quiet workspace?

140mm fans are a better choice if you want a quiet workspace since those fans do not spin that fast and still manage to keep your PC cool.

Do RGB fans consume more power?

Yes, RGB fans consume more power compared to regular fans. This is because they have a motor to run the fans and lights on the fan blades, which require more power to run.


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