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Ok ill try that, but in the meantime, its on this list: https://www.tonymacx86.com/threads/list-of-confirmed-radeon-hd-7xxx-series-10-8-3.92952/

Thanks for your help. I still cant fix the problem though. and my graphics card (HD 7870 Or r7 250) is on the supported list for Mac OS 10.9 and up i think. I injected the other fake ID you said but still the major graphics lag, and it still says "Display 7mb" under graphics card on the about...

Ok i did that and rebooted, however I still have extreme graphics issues. Major screen tearing etc. When i open launchpad I can see the white and black refresh lines going through the screen, and in about Mac it still says "Display 7mb" for the graphics card. I have the radeon r7 250 btw. Please...