Dual Graphics: A8 HD 7640G + HD 7670M Poor performance

Hello,
I have HP Pavilion G6-2005AX Laptop ((AMD processor) APU Quad Core A8/ 4GB/ 500GB/ Win7 HB/ 1.5GB Graph)...

Graphic card details :
1 GB AMD Radeon HD 7670M Dedicated
512 MB AMD Radeon HD 7640G Graphics ( Integrated with Processor )

I face performance issue when I enable Dual Graphics on it:

I have tried to play NFS13 game with just the integrated 512 MB Graphics card enabled and the game works fine...
But when I enable dual Graphics card (using AMD control center) the game freeze at times while I play........and I always feel like the videos stucks somewhere...

Is there any way to rectify this problem...
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More about dual graphics 7640g 7670m poor performance
  1. Try downloading updated drivers.
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