The Importance Of Proper Pelt Cooling... in Overclocking and Cooling Posted April 7, 2004 · Report reply Just to clear things up with all the people who mentioned the auto-shut off on the mother board... Even if the board shuts itself off, those who know about peltier cooling know that a relay is needed to be able to shutoff the mean well psu's. One -was- on the way for me to use but fate got to me first. So, in a way, this is a thred about the importances of relays in water/pelt systems. But more importantly, there are some people out there crazy enough to try anything to get their OC's.