"Power supplies are one of those things you don't think about
until yours dies. If you've been using personal computers for a
while, there's a pretty good chance you've had a power supply fail
on you. It's probably not as common as it once was, but that crisis
does still happen. The other issue for some is what to do if you
want to upgrade your graphics capabilities but don't have a
sufficiently beefy power supply?
"We'll try to answer questions like how does one choose a power
supply; how do I size one; what are rails; what is "modular"; what
does "green" mean; and what is "certified" and does it matter.
We'll do that by looking at a number of vendors and how they help
you choose one of their products."