It has 3 modes:
Silent mode gets its name because it reduces the voltage of the system, so there is less likelihood of activity coming from the hard drive or fan. By reducing the power level, the laptop runs slower, which is great if you’re working on basic every day tasks. The benefit, besides a silent running laptop, is that battery life can be extended.
Normal mode, is as the name suggests, the default setting for the Samsung laptop and runs the system at the level of performance you have already defined in Samsung Battery Manager.
Speed mode is the final setting and effectively overclocks the CPU by running at its most efficient. This mode is great if you need to make sure the full system resources are being used by apps on the laptop, which is great if you need to run something a little more labour intensive, such as video.There is also package for Arch Linux here: