Molex Fan Connector connects the fan to your PSU (Power Supply Unit).However, it uses the sense pin to control the RPM according to the CPU load. 4-pin Pulse Width Modulation (PWM) is also connected to the motherboard.Fans connected with this cable spins at maximum RPM unless we change the speed from the BIOS. 3-pin DC fan connector cable connects the fan to your motherboard.You can find three types of cables that connect the fans to the motherboard/power supply. Depending on the cables attached, the fans on a desktop PC are connected either to the motherboard or the power supply. How Does a Computer Change the Fan Speed?įirst, let’s discuss how a computer controls its fan speed. However, you can control your fan speeds according to your needs using third-party applications or tweaking fan settings on your BIOS. If you are doing some CPU-intensive tasks, your CPU cooler will spin at a higher RPM (Rotations Per Minutes). You can’t control fan speed because they run continuously and use the TDP (Thermal Design Power).A computer adjusts its fan speed according to the load it gets. Some Lenovo Legion laptops are the perfect example of this. You won’t find a fan speed control option in some cases because the BIOS doesn’t support this feature. There are many BIOS versions, and each one has different menus and labels. If you don’t know how to enter BIOS, check our extensive guide before proceeding.Ĭontrolling fan speed in the BIOS depends on your PC or laptop. The most straightforward way to control fan speed is by making changes in the BIOS. Once the hardware is clean, you can optimize fan speed to your liking by using one of our methods. If you’re having problems with your fans, first clean your computer properly because fans work extra hard when there is dust and grime. This article focuses on several methods of controlling fan speed. However, if your computer fans are loud all the time or fail to kick in and your CPU becomes hot, you can fix both issues quickly. Your PC should be fairly silent when you’re browsing the internet, but it can get loud when you’re playing a demanding game. Fan speed is often controlled automatically based on the hardware temperature.
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