I recall the site that posted that info. It would now be rather badly dated(the latest was about 2003)and was misleading even several years ago. In one column it showed the advertised power rating, which in most cases was the more realistic 2-channels driven at full power for at least five continuous minutes rating complying with the FTC power regulations. Then in another column it showed a 5 or 6 channel driven result, which was of course significantly lower than the rating with 2 channels driven. The implication was that the receiver had "failed" to meet its advertised power rating, which would be a violation of the federal regulations, and which wasn't true of course.

More sophisticated analysis of power requirements recognizes that driving all channels simultaneously at full power isn't a realistic home audio scenario, regardless of the number of channels in the source material. Audioholics, for example, has been quite clear on this and tests with one and two channels driven.

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Enjoy the music, not the equipment.