@dosdude1 I recently installed RX570 in Early 2009 MPro, after using GT120s, and the card only works in Rescue Partition. Any advice on how to get it to work normally? Does a patch need removal?
If you installed the Legacy Video Card Patch, you must re-install the OS to overwrite those patched files. No need to erase of course.
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Thank you so much. I ended up reinstalling MacOSX before you tweeted and it worked! Strangely, the GT120 still works with the Cinema Display.
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GT120 definitely needs to be removed in order to achieve full graphics acceleration on the modern card.
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