You could always get an app like GPU-Z to really dig in there and view fan speeds, and go crazy, but sometimes you either forget to load it, or you just don't need to know that level of detail. Sometimes you just want to know if it's been pegged at 100% or if you're settings are OK (in other games, since you could run TF2 on a potato). To open the Task Manager in Windows 10, right-click the task bar, and choose "Task Manager". You'll find this at the bottom of the Performance tab. To tell if you're running the latest version of Windows 10, click the Windows Logo in the bottom left corner, type check for updates, open the app, and press the check button.