Case Fan 120mm Vs 140mm

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If you are shopping for a new case fan you might be wondering if you should buy a 120mm or a 140mm one. You may be tempted to pick up a 140mm model right away because they are quieter and cheaper. But before you make your decision you should consider a few factors. Read on to discover the advantages and disadvantages of each case fan. In addition we’ll go over the performance noise levels static pressure and mounting holes.


Are there any differences in the performance of case fan 120mm vs 140? If you are in the market for a new computer you might want to consider a larger 120mm model or a smaller 140mm model. Both have the same basic specifications but with different features. The size of a case fan determines how well it can circulate air and perform its function. A 120mm case fan measures approximately 120mm in length and width and it is 25mm in height.

Unlike their 120mm cousins 140mm case fans tend to have a smaller market than their larger siblings. The good news is that there are dozens of brands and models on the market including a number of no-name models. Because of their low demand you can find a high-quality 140mm case fan for a reasonable price. Typically 140mm fans spin at a slower speed and therefore are quieter.

Noise levels

When considering the differences between 120mm and 140mm case fans it’s important to consider the amount of airflow each case fan produces. A 140 mm fan is likely to generate around 37 DBA at its highest speed. That’s a significant difference and the higher RPM will reduce the longevity of the case fan. Both types of case fans offer good cooling performance but they can produce different amounts of noise.

If you’re unsure about the difference between 120mm and 140mm case fans check the dimensions of each. Most 140mm fans are 120mm in diameter but you can find smaller fans with extra lighting and additional features. For example a 140mm case fan may be more powerful than a 120mm one but it’s still more difficult to find one that fits. Also keep in mind that you’ll need to determine the size of your case’s mounting holes to determine the appropriate fan size.

Static pressure

A case fan’s airflow and static pressure both play a role in performance. While airflow is a measure of how much air the fan is pushing through the case static pressure is the amount of pressure it exerts inside the case. Unless the components are situated behind obstructions high-airflow fans are unlikely to reach those areas. In contrast high-static pressure case fans are effective at pushing air through the fins on the case which makes them particularly good for cooling.

One of the main differences between a case fan 120mm and a case fan 140mm is the RPM. Generally speaking the higher the RPM the higher the static pressure. This means that 140mm fans will make more noise. Nevertheless if noise is a primary concern a low-pitch fan with a higher static pressure will be the better choice.

Mounting holes

The most obvious differences between a 120mm and a 140mm case fan are their sizes. The 120mm is common in most Mini ITX and Extended Tower PC cases. While the 140mm is generally more expensive it has additional surface area making it more flexible to mount. It’s also more versatile as many cases can support both sizes. Read on for more details about the differences between the two most common sizes of case fans.

When choosing a case fan check the mounting holes. If your case has only one look for a case that has two mounting holes. One will be about 7.5mm away from the fan’s edge while the other will be about 4mm away. If the holes are not in the same spot it is better to choose a larger case fan. However if you can’t find a case that fits your 140mm case fan there are a few things to consider.

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