I am currently upgrading my 2009 Mac Pro.  I would like to use Premiere Pro running Mojave so I need a metal compatible graphics card.  What do people think of

Sapphire Pulse Radeon RX 580 8G GDDR5? 

Some forums are suggesting Nvida would be better for Premiere, but they don't have drivers for Mojave.

Any other suggestions?

Thank you.