Its the latest card out and as such the performance summary will include all the relevant cards that perform around the 7770's level.
Take a look and see how the surrounding cards add up allowing for price/performance and then get back to us with any questions you may have.
If you click on Reviews in the top left hand corner of the link you will see a box (top centre) into which you can type the card you want to see a review about. this should give you all the info you need.