Amazon.com: AISURIX Radeon RX 580 Graphic Cards, 2048SP, Real 8GB, GDDR5, 256 Bit, Pc Gaming Radeon Video Card for AMD, 2XDP, HDMI, PCI Express 3.0 with Freeze Fan Stop for Desktop Computer
AMD Radeon RX 580/ RX 570 review | Eurogamer.net
Its up and running: 2x VII + 580X | MacRumors Forums
Refurbished Mac Pro 3.3GHz 12-core Intel Xeon W, Radeon Pro 580X - Apple