What if mobo and cpu both have integrated graphics?

Hi,

After reading some articles on the latest AMD Trinity APU, im looking forward to build a low cost budget mini-itx pc for everyday uses and very light gaming without using a discrete card.

I'm really interested in A10-5700 with integrated Radeon HD 7660D, as it is much better than the Intel HD 4000.

I know i haven't seen the cpu and the motherboard in the market yet, and the question below doesn't limit to this build:

Could there be a case that both the motherboard and cpu has its own integrated graphics? what would happen? and can i make use of the two or do i just have to leave one disabled?

Thanks for any ideas!