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It's a calculation of the number of mechanical devices in your system (drives,fans,etc...) your CPU specification, your GPU specification (if applicable)and what you intend on adding later on. Basically it all boils down to this, if you are going to be running a machine with multiple hard drives, a high end video card, and 2 or 3 case fans, multiple CPU's, etc... then you are going to need at least a 400w P.S. to keep things running smmothly.You also have to keep in mind that as the fans run , they get dirty, then they start pulling more current.So what may suffice now, may not 6 months down the line. Noise problems can be reduced by buying higher quality fans and for that matter a better quality power supply with a low noise emmision. My question for you would be, what do you consider a standard P.S. output to be and what exactly is it that you are installing that requires a higher wattage P.S.