The Tech Zone lets you in on a little secret about power supplies.  It is not the total wattage that defines system stability, it is the ability to deliver that power without fluctuations.  Find out more in their full article.

"The PSU Factor, for some reason, wasn't necessarily discussed as much in the years before when

creating computer systems for consumers. After all, consumers did not need such a reliable power

system for their machines--or so it was thought. The question of why power current was not an

issue several years ago, is still not answered. It could have been attributed to a basic lack of

awareness, or possibly computer manufacturers didn't make it a priority in creating products for

the consumer. What is potentially more revelating, is that many hard drive errors and operating

system errors in the past could be attributed to a lack of a stable power supply and a lack of a

more powerful power supply unit. Of course, we just simply won't know since there isn't much

documentation and hasn't been much investigation into past computer issues. However, we do know

many computer users are not having as many previous power supply problems when they are using more

stable PSUs (notice I didn't say MORE POWERFUL)."

Here are some more Systems articles from around the web:

  
Systems

• Two Tagan PSUs @ Dan's Data
• Enermax

  Liberty 620W Modular Power Supply @ Extreme Overclocking

• Ultra X2-Connect 550w Power

  Supply @ Guru of 3D

• Topower

  Silent Green 600W Power Supply @ ThinkComputers.org

• Ultra X-Finity

  500W PSU w/ Acive PFC @ 3dGameMan

• Hiper

  HPU-4S525 525W PSU Review on Technic3D

• Sytrin

  Nextherm 460 Watt Power Supply @ hi-techreviews.com

• SilverStone Strider ST56F 560W Power Supply @ ThinkComputers.org