Sapphire 11265-05-20G PULSE Radeon RX 580 8GB... at MacSales.com
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
RX 580 8GB 256bit - ARKTEK
ASUS ROG Strix Radeon RX 580 O8G Gaming OC Edition GDDR5 DP HDMI DVI VR Ready AMD Graphics Card with RGB Lighting (ROG-STRIX-RX580-O8G-GAMING) - Newegg.com