If your computer's running a little loud for your tastes, it's probably because your fans are running at full speedeven if they don't need to be. Here are a few ways to manage your fan's speed so they're keeping your computer cool when they're necessary and silent when they're not. We've talked about how to quiet an especially noisy fan before, but focused on computers running too hot or not clean enough. If you've built your own computer, chances are your fan speeds aren't being regulated, and they're just running at full speed all the time. This makes for a very cool computer, but it can be annoyingly loud, especially if you don't need those fans running. There are a lot of ways to regulate those fans, many of which are completely free. Here's how to set them up.