Expected to need about 200W and did not want to be too close to the limit of other supplies so chose this even though it is double what I'll ever need. One star off because it has a noisy _fan_ that was not disclosed in the product page! Just to be fair, the fan is off most of the time since I'm currently only drawing about 120W, as measured on the input side. It also helps that my wife is the most understanding of people.