Sorry for the wait, but i don't plan on playing this game so i had to find it on some other "store" rather than MAS or Steam (it would be stupid to spend 50 bucks just for testing)
The game works with my MSI R9 280X Gaming 3G
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Not one warning on compatibility or anything like that.
This is a good news for you, since you can buy R9 280X for cheap, still be able to play Dying Light and after flashing (quite easily done in Windows) there will be no downsides compared to Mac HD7950.
Thing that bugs me now is why is R9 280X supported and HD7950 isn't and does game looks for name of the card or Device ID. In other words, will it run on HD7970 since they share Device ID and HD7xxx are not supported...
If I grab some spare time, i'll reflash R9 to read HD7970 and test again. In the meantime, if there is anyone with HD7970 willing to try this out it would be great. Also, what would happened if you flash HD7950 with R9 280 (non X) rom, or just use the stock PC one (for those with flashed R9 280s) - will it run the game?