It’s worth thinking about a fan controller if you’ve fitted your machine with numerous cooling fans and third-party heatsinks. These are generally installed inside the front 5.25in bays of your case and are used to monitor temperatures and fan speeds - so you can speed fans up if your hardware’s struggling or slow fans down to quieter speeds if you have the headroom. Basic models are affordable but have fewer features, and pricier products include high-end features such as touchscreens and Internet connectivity.