[citation][nom]jigawatt[/nom]Quite a few of their cards also have quite a bit higher power consumption in contrast to Nvidia.[/citation]
Not really. Other than 7870 XT, a horribly binned card, and 7970 GHz Edition, a card literally up-clocked and up-voltage'd just to get one of the fastest card titles, AMD and Nvidia are on similar grounds for power consumption. The 7970 only uses about 5-15% more power than the GTX 680 (which is probably attributable to its memory advantage), the 7950 and the 670/660 Ti are even closer, and the rest are also on similar footing in this.