The Asus Radeon RX 580 Dual OC is a beast of a graphics card
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ASRock | AMD Phantom Gaming X Radeon™ RX580 8G OC
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PICK BRACKET 1:1) SAPPHIRE AMD RADEON RX 580 DUAL 8GBX2 MINING COMPUTE ACCELERATOR, 2 RX580 GPUS IN ONE CARD, BULK PACK, 6M Warranty, Industrial Mini | Connected Technologies
Amazon.com: KAER AMD Radeon RX 580 8GB Graphics Card 2048SP, GDDR5 256 Bit for Gaming PC Video Card with Dual Fans, 1284/7000MHz PCI Express 3.0 Computer Gpu with DVI HDMI DP Output : Electronics
Sapphire RX580 Pulse with Dual BIOS? | MacRumors Forums