Im using Mac Pro 2010 with RX 480 but I would need an additional graphic card like Nvidia Quadro or AMD Radeon Pro series under $200. I just want a slim graphic card that's all. RX 480 is not fully supported for Mac Pro and I think I need either Quadro or Radeon pro in order to accelerate GPU for photoshop.
Any recommendation for graphic card either Radeon Pro or Nvidia Quadro series under $200?
Roberto Blake offers some suggestions as a designer who uses Photoshop in his work. He clearly explains what you should be looking for and provides links to updated sources.
Some other readings. (mind that's an 7 or 8 years old box).