As it now stands, neither are faster out the box with the new Ghz edition.
It's neck and neck in the real world for the real folks@1080p.
Deal clincher for me now would be PhysX or when you go above 1080p when memory starts to become an issue when you add in maximum IQ via respected control panels.
Current 7970's are all going to do what a Ghz version can with a simple push of the sliders in CCC or Afterburner for probably considerably less cash though.
Unless you can get one considerably cheaper than the other pick what one you like.
Have to agree with this - in realworld useage performance wise theres no significant differences between the 7970 or 680 depending on the exact game your playing or clockspeeds of the card you go for/whether you overclock or not might swing it one way or the other a little but in general there is nothing in it between them.
EDIT: Driver versions do swing it a bit theres been some big changes for both cards where different driver versions have changed the performance in some apps by 10, 20 even 60% so recently a review could feasibly show one having big gains or losses in some titles one day and be a completely different story the next.
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