Where are you seeing that you can Crossfire with this system (provide a link)? I'm not seeing it.
Typically, with a laptop, the system is either configured with dual-discrete graphic cards from the get go, or the discrete graphics card is paired with an AMD APU. This is more commonly known as Dual-graphics. All that I've seen of your notebook just points to switchable graphics, which means depending on the current usage, your laptop will automatically switch between the AMD HD8750m and the onboard Intel HD 4600 graphics.
-Wolf sends