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R9 280X only displays video on one mDP port. Does it need more power? : r/ macpro
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AMD RADEON R9 280X 3GB for Apple Mac Pro w Power Cables [4k, High Sierra Ready] - $279.00 | PicClick
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R9 280x flashed with EFI
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R9 280x flashed with EFI
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AMD Radeon R9 280X 3GB Video Card for Apple Mac Pro: Step up from the 7950
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