The app also has a somewhat simple graph fan curve editor. Thus, you can fine-tune the fan control response with steps, activation percentage, and response times, and hysteresis. However, the app's main purpose is to provide you with as much control as possible in order to keep your workstation at an optimal temperature. For example, you can create custom external temperature sensors using the said '.sensor' file. It allows you to save, edit, and load multiple profiles at once, and it's capable of reading the temperature from multiple sources such as the CPU, GPU, motherboard, hard drivers, and the '.sensor' file. The first one is based on linear function, the second on a custom curve, the third is based on a temp that holds the speed until a target temperature is met, the fourth allows you to use two different curves and apply a mix function (max, sum), and fifth syncs to an existing control, while the last allows you to set a fixed percentage value. The fan curves types are linear, graph, target, mix, sync, and flat. To be more precise, this is one of the few apps that allow you to mix different curves, sensors, and graphs and even create custom fan curves. All about the fan control without cutting down on customization optionsĮven though there are a couple of other apps of this sort out there, the main thing that sets FanControl apart is its high customizability. The main thing you have to know about FanControl is that it uses the following three libraries: LibreHardwareMonitor, MaterialDesignInXamlToolkit, and NvAPIWrapper. If, however, you want more control over your computer's fan speed and functions, you can use FanControl, a free fan controlling software. Aside of this daemon, SSD Fan Control features a user-friendly application for monitoring and control.Unless you're a hardcore gamer or a user who actually needs to tweak his or her computer's fan speeds, both the OS and the computer's own internals do a pretty good job of keeping things under control. Whenever the SMC system resets to its default, SSD Fan Control takes over again to make sure that your system remains quiet. The core of the system is a daemon that runs in the background and takes care of the fan management. It enables you to overrule the automatic fan control and manually configure the fan speed. In both cases the SMC system tends to go into frenzy and drive you mad with a loud fan. Sometimes reusing the external sensor is not possible or, as in more recent generations of iMacs, replacing the original hard disk breaks the system’s temperature monitoring.

The SMC collects data from external sensors or by reading the internal hard disk temperature in a proprietary manner. Fan management in Apple systems relies on temperatures reported by the SMC system.

IMac users who tweak their systems using 3rd party hard disks or solid state disks, are often surprised by an unpleasant aftermath: an annoyingly noisy hard disk fan.

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