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If you are playing on the newly released Favella map it has poor performance compared to other maps in the game and that is game issue since it also occurs on Nvidia cards.
I also don't think you were getting 200+ of FPS on a 7950 before since every game benchmarking site has better cards than yours running at worse performance and that is with a better CPU too. For example.
I would expect something like 60 - 70fps for that GPU at 1080p resolution with ultra settings, vsync off for most maps except the above stated one.