Hello, same here. We have two notebooks in our family: my, with nvidia 670MX works fine, but my wife's with amd 8800m did not recognize it, and shows only hd graphics in the video settings (with horrible 10 fps in the main menu). GPU-Z shows, however, that 8800 is kind of working - temperature going high as well as clock settings, but it obviously does not affect the game. Other games work fine (diablo 3 runs even better then my MSI with 670MX).
Thanks!