Apple EFI AMD RX580 8GB Sapphire Nitro for Mac Pro 4,1/5,1
Used - Like New: OWC Radeon RX 580 8GB Graphics Upgrade Solution For Mac Pro 2010 To 2012. Add Metal Support to your Mac Pro and Upgrade to macOS 10.14.x Mojave. Model OWCMP1012R580V - Newegg.com
AMD Radeon RX 580 4GB & 8GB Graphics Card FLASHED for Apple Mac Pro 2009-2010 | eBay