It seems fairly obvious that AMD's Enduro was the main reason why it's FPS scores were lower overall than the 680m competitor. I would hope that since this is the case, that AMD can and will show if possible, a way to disable it, or greatly improve it to help it keep up with Nvidia at some point this year.
With AMD, though, I doubt that they will do this, so as to not concede defeat and fault with it's new switching/power saving feature.
For the record, I now own the 7970m in my Clevo laptop, and I have had no problems with it thus far, and I am getting good game play and FPS marks in the games that I am playing. I have owned Nvidia GPU's in the past, and they were fine, until my Nvidia overheated and died on me last year.
The Bottomline for PC gaming as I see it is this- both GPU's are fine for games- with Nvidia being only slightly better in some games, so for me, this is a wash either way, and I save $300 dollars in paying less for what I have. ;D
Yes, the 680M is a little more powerful/faster than the 7970M, and has more features that are nice for some people, but those things are not important to me (3D movies, video editing), so I feel no need to spend more money for things I don't need.