Comparative In-Depth Analysis of Case Fan 120mm and 140mm

case fan 140mm

The comparison of case fans 120mm and 140mm is not without controversy. Some points are better than 120 mm. However, 140mm is better when you consider other points. To choose the best option, you must nurture all points.

This article will detail the comparison. After reading the whole article, I hope you can make a decision on which casing fan you prefer. Let’s get started.

Basic Differences between ‘Case fan 120mm VS 140mm

The main difference between a 120mm and the best 140mm case fan is the size.

A 120mm case fan measures 120 x 120×25 mm.

A 140 mm fan is on the other side. It measures 140 x 140×25 mm.

It is possible that a case contains fewer 140 mm fans per case than 120 mm fans.

Head to Head: When 120 mm Fans Win

Let’s find out why a fan 120mm in diameter is better than one 140mm in diameter.


The 120 mm casing fan is compatible with many different products. It can be installed in almost any type of case.

Rarely will you find a case that does not have the 120 mm casing fan slot? There are many slots available for 120mm fans, from Mini ITX cases to Extended Tower cases.

However, in all cases, you won’t find 140 mm casing fan slots.

The 120 mm casing fan is the clear winner.


The 120 mm fan is more affordable than the 140 fans. A 120 mm fan can be installed in 140 mm slots to save money. It is also a known fact that a 140mm fan uses more power than a 120mm fan.

It is a recommendation that you choose a 120 mm fan over a 140 mm fan. It is a cost-effective factor, but it is a factor in a head-to-head comparison. The winner is a 120mm fan.


Head to Head: When 140 mm Fans Win

Let’s find out why a 140mm fan is better than a 120mm fan.


A small fan will produce more sound than one that is larger. The condition is the exact same.

A 140mm fan produces less sound than a 120mm fan. A 140mm fan is therefore quieter than a 120mm fan.

If noise is an issue, choose the quieter fan. The winner here is the 140mm fan.

Cooling power

Cooling power is the main purpose of a casing fan. A 140mm fan produces more cooling power than a 120mm fan.

If you want to increase cooling power, a 140mm fan is better than a 120mm fan.

The winner, undoubtedly, is the 140 mm casing fan.

When is a 120 mm casing fan appropriate?

  • A smaller case can be used to build a CPU (Central Processing Unit).
  • You want to spend less money
  • High static pressure

What to do with a 140 mm casing fan?

  • Build a CPU using a larger case
  • Want a comparatively quieter CPU machine
  • You are looking for high cooling power

Most Frequently Asked Questions

Are 140mm fans better than 120mm fans?

This is the most frequently asked question. It all depends on how you view a casing fan. This is why it is important to look at the point of view and not focus on which one is best or which is not. Both the fan and the critic have pros and cons.

Does fan size matter?

It is indeed a serious matter. It is also important to consider the fan size. Not only for mounting a casing fan inside the CPU casing, but also to provide efficient cooling air.

Do you prefer to have 3 120mm fans, or 2 140mm fans?

The mathematical calculations show that 3 120mm fans will produce more air than 2 140mm fans. However, the truth is that not all fats are equal. From some perspectives, 3 120mm fans are superior to 2 140mm fans.

Last words

Let me conclude by saying that I think you will be able to understand the difference between case fans 120mm and 140mm. Recall that 120mm is the best choice when it comes to compatibility and cost-effectiveness. 140 mm is the best choice when you think about cooling power or quietness.

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