how to switch to dedicated from integrated graphics card.

hello i bought a lenovo Essential G505s 9987 laptop. it has dual graphics card. amd 8550g + 8570M graphics cards. but I get very low fps even though I have dual graphics. in fifa13 I get 7fps whereas the laptop's genre is gaming, even in low settings i get 7-9fps. I think the integrated is working instead of the dedicated one. I tried in bios by changing switchable to uma. I tried disabling dual cards in device manager, I searched everything in amd driver but still the problem persists. can anyone tell me how should I get playable fps in this laptop.