Graphics Card swap

TL;DR: Swapped a GTX 650Ti for an RX480 and it apparently worked out of the box on Mojave, but gaming and photo editing performance is way worse then it should be. The rx480 was tested and works fine on windows (dual boot).

Hi all,

I successfully built a hackintosh last year and I've been running it with Mojave since.

It's a ryzen 5 1600 and at the time it had a GTX 650 Ti 2GB (the guides at Amd OS X said this board is not compatible but it ran on Mojave without any tweaks).

Now last week I ended up buying an RX480 4GB.

I simply swapped the two cards and it ran out of the box. Mojave identifies it as an RX 480 4GB and everything works fine.

Now, the main reason I got this card is because I started play World of Warcraft again. And the GTX 650Ti was giving me 20~40fps.

Much to my surprise, I didn't see a noticeable improvement on my fps after I installed the rx480, so I booted up my windows partition, and my fps on WoW is now over 80fps with the same settings I was running on macOS Mojave. (Photoshop is another example of poor performance).

What I'd like to know is: do I have to change any settings for my rx480 to perform on its full potential?

I'm hoping I can solve this problem without formatting and re-installing the whole system.