If your computer’s running a little loud for your tastes, it’s probably because your fans are running at full speed—even if they don’t need to be. There are a lot of ways to regulate those fans, many of which are completely free.  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.

Install Fan-Controlling Software:
Enhanced support for monitoring your PC and taking control of hydrostatic fan drives. Fan Control adjusts the minimum fan speed depending on the current CPU temperature. For safety, it leaves the original automatic fan speed control intact.

Tweak Your BIOS Settings:
you can turn on the "Quick Boot" option and move your hard disk to the top of the boot priority list. the boot priority tweak will tell your computer not to look for CDs, thumb drives, or other media when it first starts, which will get you booted into your OS quicker.

Buy an External Fan Controller:
a high performance external fan controller with an intuitive touch screen. Its unique patent-pending PCI card interface desktop design allows effortless control without having to reach underneath the desk to configure the settings.