There is also a great feature worth mentioning here. The Mushkin XP-800AP has a special feature that allows you to operate the power supply on four rails or on a single rail, depending on your setup and power requirements. This change is initiated by a simple switch on the back of the power supply by the main power switch; slide one way and you have the single-rail setup and the other way for a quad-rail setup.



Link: OVerclockersclub