Originally Posted by born2killU
thats possibly the most inaccurate way of picking a PSU lol
That is a rather broad statement, especially since the author specifically states:
The recommended total Power Supply Wattage gives you a general idea on what to look for BUT it is NOT a crucial factor in power supply selection! Total Amperage Available on the +12V Rail(s) is the most important, followed by the +5V amperage and then the +3.3V amperage.
It is a tool, like any other, to help get you in the right ballpark from a wattage standpoint. This version of the software is the "Lite" version. The "Pro" version is more in depth, covering amps per rail...among other things.
there are other things to consider. I didn't say that this tool was the end all, be all way of choosing a PSU.
Amperage on each rail is of the utmost importance. Stability of each rail under load should also be considered. (I like jonnyGURU's Reviews
for his research in this area.)
Some other important things to look for would be active power factor correction (PFC), the units overall efficiency and component quality.
The most inaccurate way to choose a PSU is to buy a cheap unit with a high wattage rating
without taking into consideration any of the above.
Simply put, the best way to choose a PSU is to do your homework.