All images and descriptions are for illustrative purposes only. Visual representation of the products may not be perfectly accurate. Product specification, functions and appearance may vary by models and differ from country to country. View cart “MSI Radeon RX 580 ARMOR 8G OC Graphic Card” has been added to your cart. Apple says these Mac Pro graphics cards are Mojave compatible, reveals Boot Camp support limited for iMac. By Andrew O'Hara Monday, September 24, 2018, 06:43 pm PT (09:43 pm ET).
The important compatibility is with the Big Chip on board. If it is the same as another recommended card, your slightly different card should work just fine. It may have different interfaces.
Msi Gaming Radeon Rx 560 Mac
The amount of RAM on these cards adds a little speedup under certain conditions, because if there is enough RAM, the next screen can be drawn into 'off-screen' RAM, and then made active, which allows it to 'snap' into view. I don't think any well-known graphics card is 'starved' for RAM in a way that would really slow it down.