text: Actually, it isn't better to leave your computers going 24/7.  While it will make your power supply last longer, everything else will wear out faster, and your electric bill will roughly triple.  Well, your computer's portion of it will, anyway.\n\nAlso, you're much more likely to need to buy a whole new "rig" sooner if it's left going 24/7, because computer components are sensitive to voltage peaks/spikes, but only while they're running.  They will experience 3x the voltage peaks/spikes if they run 24/7.