Using a dedicated GPU on a TBC client

Well i am using a Dell Inspiron 3537 laptop with both Integrated Intel HD 4000 and a dedicated AMD Radeon 8870m graphics card. The problem i face when i play on the Outland server is that the client itself does not recognize the dedicated GPU thus leaves me with lower fps and an overall slack experience. Is there any way to force my dedicated GPU to the wow client ? I have tried the basics with the AMD catalyst control center / Windows Power Options but I still cant make it work. I know it is not a hardware issue because i run newer games on high fps on top notch settings. Any advice or help would be grateful.