You want a supply that's rated to put out at least 25A. Running a supply right at it's maximum output rating is not a good idea. Low end PC supplies like that one are rated for very brief current drain on their rails (a minute or two). The whole unit is rated for 400W max. If you load all the outputs, you get something like 520W. What you *think* they are saying is -- "I can take 400W off any output". What they really are saying is "the real ratings are about 3/4 of what's shown on the label". On a printer you may be pulling a lot of power for 10's of minutes to many hours. These low end PC supplies just aren't up to that.
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