RX 480 and El Capitan?

Unfortunately, I'm in a situation where I need to get a new videocard asap for my 4,1 (flashed to 5,1 and CPU upgraded) mac pro. I was looking at a flashed 780 since I really didn't want to mess with drivers and I understand it's the highest Nvidia model with drivers in the osx; but I am intrigued by the RX 480. I saw the thread on the PC RX 480 working natively in the Sierra beta; but are the drivers for the RX 480 there in El Capitan as well?

I can live without a boot screen, if...

RX 480 and El Capitan?