All - Searched some, but did not see a direct answer (if anyone has one). I have a 4,1 8 core that I've flashed to 5,1. Running 10.12.6. I'd like to upgrade to this: Radeon Red Dragon RX-570 4GB GDDR5 Video Card but would like to know if I can simply install it and have it be recognized. Thanks in advance! PS - I get an error when trying to install the new nVidia driver - it keeps saying installation failed. Will search, but if anyone knows offhand what might be happening I'd be grateful!