![]() ![]() How to connect a 3-pin fan to a 4-pin Molex connectorĪll is good if your fan has only a 3-pin Molex connector while your motherboard only offers a 4-pin one. Motherboards usually have the designation name of it on the silkscreen print. Usually, its housing will match with a clip on the back of the pin header on the motherboard.Īlso, double-check that you are plugging the fan connector into the correct pin header. You can easily create speed profiles using your BIOS or third-party software like Fan Control.Īll you have to watch out for when plugging a fan connector into the motherboard is that it goes on the correct way. The 4-pin header has everything the 3-pin connector offers, plus an extra pin for PWM (Pulse Width Modulation), which can add speed control to your fan without needing an extra speed control circuit. The 3-pin header includes a pin for ground power or negative (-), one for positive power (+), and a third pin for an RPM (Revolutions Per Minute) sensor. Most motherboards include fan connector headers that either have 3 or 4 pins. Yellow or Red (If the sensor wire (3) is yellow, then this one will always be red.) How to connect fans to the motherboard Pin Number Let’s go over each type, and you will see how they should be connected depending on the type of connection. There are a few common types of fan connections that are used today. Don’t be afraid to geek out a little and compare noise in relation to airflow volume between various models and makes under their respective specifications area.Larger fans are better for reduced noise as they don’t need to spin as fast for reasonable airflow, reducing noise, especially at idle.Fans with only three wires aren’t as easy to control as those with four.So try and opt for something well-known, or that has received good reviews. Cheap fans may not last very long and may produce more noise.Choose the correct size for what your case can accommodate.If you don’t have your fans already and still need to purchase some, there are a few things to consider. Now that’s out of the way, let’s look at how you can connect more fans to your PC. Important: Always make sure that your computer has been turned off and isn’t connected to power before connecting or disconnecting any fans. This can lead to poorer cooling than you had before adding new ones, and I’m sure that wouldn’t have been the desired outcome from anyone. How To Connect Fans To A PCĪdding fans facing the wrong way or situated incorrectly inside a computer case could detract from your system’s overall cooling strategy. This is a handy first step to understanding before adding more fans. ![]() Our other article about PC airflow optimization discusses how you should set up the airflow and air pressure type. Cases generally provide more than enough mounting areas, so you don’t have to worry about your computer overheating. With most computer cases today, adding more fans is easy enough for most people. Not only do the connection types differ, but how you install them is also important. It is strange it shows one speed but a voltage range.We will cover everything you need to know about how to connect more fans to your PC. All are (6)4 pin headers for the fans except one and it is a 3 pin header. When you buy the fan make sure you can control the speed: If you don't own a fan you can find some fairly cheaply but you need to find out what controller you have. Set to 100%, then 40% to see if the speed changes.ĥ) Example fan profile: case fan at 40% speed until 40degC then RAMP up to 100% speed at 80degC (it will never reach 100%). ![]() May have to just try a fan).Ģ) Enable fan control in the BIOS if needed.ģ) Download and install your motherboard fan control software (motherboard support site).Ĥ) Play with the fan profile. ![]() Older motherboards may have VOLTAGE only for everything.ġ) Determine what TYPE of controller you have (not always obvious. My motherboard supports both PWM and Voltage for the case fans, but only PWM for the CPU_FAN controller. The two types are:Īdditionally the FAN controller must be capable of controlling this. MOLEX is usually not controllable, though there are some rare exceptions which work with 3-pin/4-pin adapters. *There are two types of fans that have speed control. ![]()
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