120mm Fan Vs 140mm – Which Is Best Cooling Fan?

Are 140mm fans better than 120mm?

However, the natural performance of 140mm is a bit exceeding the 120mm fans in most features. With more air moving ability to a good noise reduction providing, the 140mm is undoubtedly a suitable choice to go for if your apertures willing to accept it.

Is it better to have 2 140mm fans or 3 120mm fans?

Look for the fan’s specifications. If a 120mm fan drives only 30 CFM of air, but a 140 drives double that (hypothetically), then 2 x140 fans would likely be better in performance. Also, more fans generally mean a louder pc.

Are bigger fans better?

If a PC fan is Considered, bigger IS better.

  • 127mm = 5 inches
  • 150mm! = 5.9 inches

The bigger the size, the lesser the noise will be.

How much air does a 120mm fan move?

Usually, a 120mm fan can move 20 – 80 Cubic feet per minute.

120mm Fan Vs 140mm

120mm fan VS 140mm

It’s easy to kill hours haunting over the best setup to lessen your PC temperatures just that little bit more. One of the most crucial aspects is what arrangement of 120mm & 140mm case fans you place. But which type of setup is better? Here know everything about 120mm fan VS 140mm PC fans, comparing noise, speed, performance, size, and price. Also, see the best suggestion for the best case fans for your next PC build!


The main difference between the 120mm VS 140mm fans

  • 120mm Case fan

Speed: Up to 1200 RPM

Sound frequency: Depends upon the Model of the PC

Airflow CFM: Low CFM

Dimension: 120 x 120 x 25 mm

Required Slot: 3-Slots

price: Reasonable price


  • 140mm Case fan

Speed: Up to 1000 RPM

Sound frequency: Depends upon the Model of the PC

Airflow CFM: Higher CFM

Dimension: 140 x 140 x 25 mm

Required Slot: 2-Slots

price: Substantially reasonable price


A few miscellaneous parts like bearing type define the sophisticated features of a fan’s performance, but by far, the two most impactful specifications (and the ones you must focus on) are RPM and CFM.

CFM, or cubic-feet-per-minute, is the air volume a fan can move per minute, and an essential specification is when setting cooling capability.

Most results and analyses reveal that the average 140mm fan, with its larger blades, manages to possess a significantly higher CFM rating and can provide better airflow in a case per fan related to 120mm offerings.

Things like size, blade design, material quality can affect the CFM, especially RPM.

RPM, or rounds per minute, is how many times a fan can rotate per minute. So, for instance, if you owned two fans identical in every way other than their RPM, the higher RPM fan will produce better CFM.

Commonly speaking, 120mm fans usually have somewhat higher RPMs if we compare the same 120mm/140mm models.

It ensures they don’t fall too far behind the high airflow/CFMs of 140mm presents, running at lower rounds and achieving the same as a 120mm fan running harder.

As mentioned above, the performance of 140mm fans is the best in most situations, but 120mm can still be a great partner if your fancied case focuses on them.

As always insist, quality matters most. The range is extensive; for mainstream options, fans in either size manage to vary from around 600rpm to 3000rpm, but for some absurder offerings, they can go as high as 10,000rpm.

So at the end of the day, 120mm fans are usually the better option for airflow if your build permits it. The thing most important is choosing high-quality fans in either size and a framework that promotes good airflow.


Suggestion: Uphere 3-Pack Long Life 120mm Cooling Case fan – It’s the best 120mm fan for your PC build; it holds the best consent power and performance.


Even though 120mm fans hold a fair amount of RPM and CFM, still 140 mm fans are the best option, as far as noise is considered. 

A low noise-focussed 120mm fan will be quieter than a regular 140mm offering. But if we are discussing obtaining the quietest fan setup, I would recommend 140mm-focussed setups.

The reason is relatively honest; 120mm fans have to spin at somewhat faster RPMs to produce similar cooling to 140mm fans as per our airflow section.

While other factors do value dB production, if you put two identical fans head-to-head, the RPM they work at will be the most significant sign of more noise.

You might consider the blade fan size must matter but have you ever imagined how a ceiling fan in a house could be nearly inaudible, but a tiny desk fan can get loud quickly? It is fundamentally to do with the ceiling fan having to spin way less to cool its surroundings.

In other words, because 140mm fans have to spin less fast to produce suitable thermal control, they offer notably less noise on the medium than 120mm fans. While not strictly related to the 120mm VS 140mm fans, it is worth discussing this specification if you are curious about the noise.

3-pin headers on your motherboard control DC fans, while PWM adds a pin that enables the fan’s motor and voltage requirements to signal each other more efficiently than DC units.

Both types of fans require a minimum RPM to operate. Due to the PWM’s enhanced signalling, fans with this functionality can produce lower RPMs.

So for something focussed on quiet operation, it’s an excellent little bonus to have a PWM fan. A good DC fan yet goes to relatively low RPMs; it will satisfy even those focused on a silent build. Consider PWM fans if you have 4-pin headers by all means, but only think about it as a nice-to-have and not an essential factor of a quiet machine.


Suggestion: Enermax Marathon 120mm Silent PC Case fan runs at 17dBA noise level with an excellent cooling effect.

AIRFLOW CFM (Cubic-Feet-Per-Minute)

While CFM/RPM is where the critical difference befalls between 120mm/140mm head-to-heads, CFM is a critical specification for particular positions.

Static pressure is the evaluation a fan gets; in other words, how much of the airflow/CFM offered will enter heatsinks or mesh enclosures.

Giving air into mesh-like barriers is a very different intent to airflow in clean surroundings, so different fan models specialise in this area.

There is no obvious winner in 120mm VS 140mm for static pressure, so it will come down to whatever your setup permits you to install. I suggest 140mm if reasonable due to its CFM advantage.

So if you want average static pressure fans to cool your CPU heatsink, the Noctua 120 and 140 is the ideal pick at a mid-range budget. As far as multitasking is considered, 140mm is a better choice than the 120mm fan. Even though 120 holds moderate CFM, still 140mm fan better CFM than 120 mm fans.


Suggestion: Corsair Co-9050044-WW ML140 140mm Case fan – It’s the best 140mm fan option for your PC build. It runs seamlessly in challenging surroundings.


Seldom, examining the differences between 120mm and 140mm PC fans is like apples and oranges because it depends on the PC case’s compatibility.

The regular 120mm fan dimensions are 120mm x 120mm x 25mm and the regular 140mm fan dimensions are 140mm x 140mm x 25mm 

In other words, 140mm are always notably significant, and most PC cases can hold fewer 140mm fans than 120mm ones.

Reiterate one of our key points into the feature: it is always better to focus on getting a high-quality PC case for your requirements. That could be anything from the largest, the cheapest, the quietest, or the best all-rounder; whether it holds 120mm, setups, or 140mm setups better is a secondary purpose.

But if you have the gratification of picking between them, you will frequently be comparing considerable numbers of 120mm fans and how they can function versus less 140mm fans. The most common battle is “3 120mm VS 2 140mm.”

120mm fans are lightweight; it is easy to install and holds less space than 140mm fans. 140mm fan weight much than 120mm fan and require some space for installation. For 120mm fans, it holds the distance between screw holes is 105mm, whereas, for 140mm fans, it is 124.5mm. It weighs much than 120mm fans. So the heavy battle between  “3 120mm VS 2 140mm” the apparent winner is 120mm fans.

Frontrunner 120mm fan holds a fair amount of space and airflow. It is user-friendly, which means you can install it on your own.

Suggestion: Cooler Master Sleeve Bearing 120mm fan – Holds better space management with efficient airflow.


As far as the slots are considered, both 120mm fans and 140 mm fans have dissimilarity. The dissimilarity is mainly because of the Size and Dimension of the 120mm and 140mm fan dimensions.

Lets we start with a 120mm fan. It requires three slots in front and top of the PC’s casing, and it will hold 4 to 3 pins to link with the PC for airflow while running the PC. Still, it needs three fans to supply decent airflow.

Hmm, 120mm fans can set up either horizontally or Vertically depends on your desire. Still, there is an option to use two slots, but it will not provide adequate airflow to the PC.

For 140mm fans, it requires only two slots, and it will provide a good amount of air supply to the entire PC even if you do multitasking. It will ensure your PC to have extreme cooling airflow ability. It is a more significant feature to consider. Still, you had an option to hold one fan, but it will not match your requirement if you are a multitasker.

So the heavy battle between 140mm fan VS 120mm, the apparent winner is 140mm fan. 140mm fan will provide better airflow compared to 120mm fans.

Suggestion: Corsair AF140 LEDLow Noise 140mm RGB fan is the better option for your requirements. If you are an RGB fan lover, then it’s the best choice for you. 


If price is taken into look, 140mm VS 120mm holds few differences. If 120mm fans are considered, those fans are at a reasonable price and will never let you lose lots of bucks in your wallet. It will also never let you repair centre or service centre for feature enhancement. Moreover, maximum, you can spend 10 to 30 dollars for the 120mm fan. Lesser price is because of its quality and airflow ability.

Well, for 140mm fans, it is pretty expensive than 120mm fans because of its premium airflow mechanism. It will let the PC holds the best cooling requirement. Since it holds the best cooling system, it will never let your motherboard fry. It will cost between 10 to 35 dollars.

As far as performance is considered, both fans are ideal to use. In the nuanced performance, a 140mm fan is the better choice.

At the end of the heavy battle between 140mm VS 120mm fans, 140mm fan is the winner with meagre points. Depending on your budget and process, pick your ideal fans for the PC.

Suggestion: For 120mm fan – Arctic P12 PWM 120mm Case fan

For 140mm fan – Fractal Design Silent Series R2 140mm Case fan

TOP 5 Products from both Case fans

1.120mm Case fan

#1 ID-COOLING ZF-12025 PASTEL – Ideal for PC build

#2 Fractal Design Dynamic X2 GP12 Computer fan – Ideal for Silent PC

#3 Uphere long life 120mm Cooling Case fan – Ideal for improving Efficiency

#4 Be quiet! Pure Wings 2 120mm Cooling fan – Ideal for Exhaust

#5 ARCTIC F12 120mm Standard Case fan – Ideal for Bucks!


2.140mm Case fan

#1 ARCTIC F14 Silent 140mm Case fan – Ideal for cooling

#2 Uphere 140mm Case fan – Ideal for Gaming PC

#3 Thermaltake Pure 14 140mm Hydraulic Bearing PWM Case – Ideal for best airflow

#4 Corsair ML 140 Pro140mm Cooling fan – Ideal for smooth performance

#5 Phanteks 140mm Retail Cooling fan – Ideal for Long usage

Which one moves beyond the other?

However, the natural performance of 140mm is a bit exceeding the 120mm fans in most features. With more air moving ability to a good noise reduction providing, the 140mm is undoubtedly a suitable choice to go for if your apertures willing to accept it.

Let’s crush everything one last time.

Performance: 140mm usually gives superior airflow/CFM, except for more 120mm fans in open cases with no PSU shrouds.

Noise: 140mm is the apparent winner, ought to spin lower to deliver the same performance as a 120mm counterpart.

price: 140mm fans are slightly more expensive, and 120mm fan is affordable.

In a majority of states, I suggest 120mm fan setups.

However, let’s wrap up the discussion with a crucial point; the fan’s quality is more significant than the size, whether it is 140mm fan VS 120mm, stick to a high-quality product to meet your requirements.



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