[H]ard|OCP reviews 5 PSUs ranging from 450W to 500W and from $20 to $100.  There are a lot of systems that only need a maximum of 500W, in fact for most office PCs it is almost overkill.  You would expect that these PSUs would be very stable and conform to specs, as the PSU manufacturers have managed that with PSUs twice as powerful.  Read the full review, as you may be surprised what they found.
“You guys asked, “What about regular mid-range PSUs?” So we bought five power supplies and then tested them to see if they would do what they were advertised to do. A melting fiery mess proves you get what you pay for. 5 PSU enter, 1 PSU leave.”

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