The power supply, absolutely the most vital component of a computer is all too often overlooked. Without it, what would you have nothing but an inert cube of mods and ends. “But I have one already, my drives are spinning, lights are glowing, everything’s peachy keen” you say. What most of us don’t realize is that there’s more to a power supply than just converting the alternating current (AC) line from your home to the direct current (DC) that your components need. Power needs to be stepped down to many separate voltages to ensure everything is getting the power it requires. These voltages must be kept to safe and strict standards set forth by the UL, IEC, FCC and countless other acronyms. The voltages your power supply unit outputs range from +12 Volts all the way down to -12 Volts. “There are Negative Volts?” That’s right. Let’s take a look at the most important ones and what there uses are.