From the gamer's and game itself's point of view, the differences between the old AGP and the newer PCIe don't affect anything. What can be a probem is when a game used OpenGL instead of DirectX, and rather few AMD / ATI Radeons have supported OpenGL after the X000 generation of cards (X700, X800, X850, etc). Personally, I don't claim any familiarity with your particular old game, so I do not know with certainty that I have identified any vector for your symptoms.
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