If you want to even more benchmarks to see how the integrated Radeon HD 7660D may perform click the following link for a review of the nVidia GT 640. There are benchmarks for various resolutions.
The Radeon HD 7660D's performance will be between the Radeon HD 5570 and the GT 640. Probably a little closer to the Radeon HD 5570 though.http://www.techpowerup.com/reviews/Zotac/GeForce_GT_640/6.html
Lastly, the chart below from the same review summarizes the performance of the cards in the review.