Correct graphics card is not being used
Run the AMD Catalyst Center, go to the switchable Graphic Application settings, click on Add application and select the exe of the game and set it to high performance.
Now download the tool call OpenHardwareMonitor and add the AMD Radeon HD to the gadget. if the GPU is not used you see this:
If the GPU is used you see this:
Is your AMD card now used? Or is still the Intel HD used?