You can monitor the speed of the fans installed on the processor using a free tool "Speed Fan". You can monitor the fans without going to the Bios. Download and install "Speed Fan". You can monitor the health of the fans and the S.M.R.T status of your hard drives too. If the fan is running slow, then your CPU can over heat and cause problems. Dust can clog the fans if they are not serviced on time, and your computer can start running slow or even shutting down without any warning. This tool is best way to address some problems quickly and without even opening the cabinet. You can even know the temperatures of your processor.
Website : http://almico.com/sfdownload.php