[Dragon Age: Inquisition] Awful Performance on any Settings

I understand your frustration but, forcing your computer to run programs that are beyond it's specs will cause more wear and tear and, thus components weaken, loose performance and fail sooner than if you had not ran the program.

All you can do is insure that the game uses the AMD graphics card, all settings are as low as possible and, you run only what you must with the game. If that does not work, there isn't much you can do short of getting a new computer.