TriEclipse
Daemon Poster
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Efficiency isn't really that big of a deal. 70% is the accepted normal, with up to 85% on some of the really high-end ones like the Thermaltake Toughpower.
As long as a [reputable] company doesn't put more than 18A on each +12v rail, they should be fine. Nowadays, even the minimum requirement for a PSU should have 2 x +12v rails, and a decent amount of amps on them. Overload of amps only occurs with more than 20 Amps on any single +12v rail. Amperage is a huge deal, and I would be willing to drop looking at Watts altogether when picking a PSU, but the watts can come in handy sometimes. Lots of amps are good, but more than 20A on a +12v rail are not.
As long as a [reputable] company doesn't put more than 18A on each +12v rail, they should be fine. Nowadays, even the minimum requirement for a PSU should have 2 x +12v rails, and a decent amount of amps on them. Overload of amps only occurs with more than 20 Amps on any single +12v rail. Amperage is a huge deal, and I would be willing to drop looking at Watts altogether when picking a PSU, but the watts can come in handy sometimes. Lots of amps are good, but more than 20A on a +12v rail are not.