No. The power supply is one component that can't be measured with software...at least not accurately. Most motherboards do keep some sort of figure on the voltage, but it's not measured at the source, so it's dubious at best.
The only way to properly figure out how efficient the unit happens to be is to use a load tester and measure the output of each rail. The bad news is these aren't something you can just snag off the shelf.
Having said that, is the 550W EZ Cool PSU you have listed in your computer specs still accurate? If so, EZ Cool is unfamilar, and if it was cheap, light weight, and/or came with the case, the odds are it's a piece of junk all around.