The electrical premise is sound, and if done correctly, with the entire computing industry behind the transition, it could save energy costs, but direct current systems will not replace alternating current systems anytime soon.
The capital equipment and start up costs, as well as the "one off" engineering costs, will be higher and out of reach for everything except new greenfield builds.
One thing not mentioned in that article is the inherent advantages of the collapsing magnetic field of the transformers which are upstream of all these rectifiers in capactive power supplies, which makes the switching times tolerable (Reference CBMA) to PC's from one power source to the other (i.e Utility voltage to UPS or A/B Automatic Transfer Switch)
I read this article on AC vs. DC in the data center http://www.datacenterjournal.com/News/Article.asp?article_id=638 anyone got any comments on it?
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