I use to start off every power supply review by saying that the power supply is the most overlooked component of the computer. I really don't think that's the case anymore. Most enthusiasts that build computers are very aware of the importance of a good quality power supply. What I'm seeing now is that people are buying into the marketing that you need a 1000watt or larger power supply to run your computer. Maybe it's not marketing. Maybe you really need a large power supply. Sigma has sent over a 635 watt power supply.