Do modern power supplies require any minimum load present on the +12v, +5v, and/or +3.3v rails? I've heard some can become fritzy if there is no load present on one or more of the voltage rails. If so, what is considered a minimum safe required current load for each of the aforementioned voltages? I'm assuming the +5vSB and -12v rails don't require anything. Obviously the +12v is easy to load with fans, and the +5v and +12v could be given a load with an old hard drive, but I still wonder what could load the +3.3v rail and if there are any rules of thumb for minimum load vs. output current claimed at each voltage, for example. Thanks for any help.