![]() Add in RGB lighting, other components, and additional stress, you are definitely not getting any quiet. In general, you aren’t going to get a fan that is completely silent. This can cause it to be more distracting to some people. A 4 pin fan will be quieter most of the time, but the sound isn’t as consistent. The three pin fans rotate at a high potential the noise is steady and consistent. If noise is something that matters to you, whether you are using your computer in a dorm, computer lab, or other work environments, then there is a notable difference between the noise emissions of a 3 pin fan and a 4 pin fan. PWM is the main reason it is easier to find a 4 pin fan header and why it is so compatible with modern computer parts, including video cards. It is somewhat harder to control voltage without actually breaking down the computer and getting into the mechanical aspects of the pin. Now, it is possible for a 3 pin fan connector to control rotational speed, but it takes more work and is done through software, not automatically. The RPM will slow down, and the voltages will go down whenever possible. As the processor shifts, so will the fan. PWM helps to cool and control heat when your processor is under heavy duress. A fan running at full speed will cause breakdowns. Your computer needs to be able to weather this load and remain efficient. Anyone who uses their computer or laptop heavily, whether they are gaming, editing, or even streaming, needs more cooling at certain times than at others. It takes the cooling systems of yesterday and moves them into today’s world. – Pulse Width Modulation Is the Biggest DifferenceĪs mentioned, PWM is the biggest difference. These differences impact how the fans themselves operate and interact with the rest of the computer, not necessarily how they physically cool it. There are a few differences to understand other than another wire and connector. The main difference between 3 Pin and 4 Pin Fans is, 4 Pin fans are quieter, last longer and have automatic Pulse Width Modulation while 3 Pin fans are noisier, have shorter lifespan and the rotation speed is controlled through software. Used with parts that have high power consumption What Is the Difference Between 3 Pin and 4 Pin Fans? Features That single wire is the biggest difference between 4 pin and 3 pin fans, but there are a few other things to be aware of that make them unique. It adjusts the speed and provides feedback, so noises are reduced, and your cooling system can be more efficient. The PWM wire is critically important for most modern gaming setups and any professional computer. ![]() This is used to help control the power supply of the load, which controls the rotation speed of the fan impeller. This wire is called the “ PWM wire” or the Pulse Width Modulation wire. A 4 pin fan connector is different because it has a fourth wire. Most modern computer builds, and motherboards have transitioned away from 3 pin fans and instead use 4 pin fan headers. Other than that, a 3 pin fan works the same as any other type of computer fan pins by moving hot air from the different components (like the motherboard or CPU) and pushing it out through vents. When the fan increases or decreases the voltage, the speed changes. It adjusts the level of power that gets applied to the motor by transmitting the speed of the fan impeller (the fan’s rotation) at a set voltage, typically somewhere between 5 to 12 volts in most standard fans. The tachometric signal controls most of what happens within a 3 pin fan. All of these wires work together to regulate fan speed, performance, and PC cooling. The wires are for power (first wire), ground (second wire), and tachometric signal or speeds (third wire). ![]() The name also means that there are three wires.
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