I have had my new 7970's for a week now, and have been quite pleased. My video card provider has offered to send me out 2 of the gtx 680's. I currently play at 1080p resolution and am looking at either eyefinity or 3d in the next month. It looked like the xfire 7970 were beating out or barely trailing the new 680's in SLI. Opinions, thoughts?

7970's clock 1300/1800 max and 1250/1650 24/7. In a dual card config, is it worth it?