Most CAD systems will work with the Radeon series of cards, just they aren't certified. If you have graphics problems, you are on your own.
The difference between the gaming and engineering cards is where the intense OpenGL processing is being performed. Most gaming cards are designed for Direct-X display generation. Engineering cards are designed for OpenGL display processing. Using a Direct-X card for a system that is outputing OpenGL calls, requires the CPU to perform the display calculations and pass them to the card for display. This slows down the CPU. With an OpenGL card, the raw commands go to the card and its GPU does the display generation.
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