Radeon HD 7770 with A105800k

I have not seen any benchmark results with the integrated Radeon HD 7660D and Radeon HD 6670, but I am confident enough to say that at best it might be as powerful a a Radeon HD 6750. That is less powerful than the Radeon HD 7750 which is basically equal to the HD 6770. Additionally, I would assume the game needs to be able to take advantage of "Dual Graphics" / hybrid crossfire to get the combined performance.

In a nutshell, you are better off with the Radeon HD 7770.
 
I would suggest a 65w A10 5700 Trinity APU with 2133MHz RAMs ...

THOUGH the 5800K with the HD7770 will provide your best gaming performance in latest titles.

You need to consider the games you will be playing ... and your screen resolution and game settings.