I have an AMD Radeon R9 M275X card on my laptop alongside the integrated Intel HD, and the framerate is certainly higher than it would be without the AMD card. On my old computer, the game would throw an error when I go above minimum shaders and display as if it was off. However, on the new one the error does not appear yet the game still displays as if shaders were off. In addition, shadows aren't drawn at all, though the rest of the lighting looks as if it works.
Help appreciated ;)