To get into the bios, first reboot. Just as soon as the dos like screen appears you can start hitting F10 until it gives you the bios screen. Now look around in there for a heading that will have the processsor listed, it should show its current speed, and will have a menu that you enter that will show other speeds. Take note of the highest.
Also dont change any settings in there anywhere, it could cause a problem with your computer. If your worried, dont do it.