XFX Double D Radeon R9 280 Video Card R9-280A-TDFD - Newegg.com
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ASUS Radeon R9 280 Graphics Card with DirectCU II
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Amazon.com: AMD Radeon R9 280X 3GB HDMI PCI Express Video Graphics Card for Apple Mac Pro, outperforms ATI Sapphire Radeon HD 2600, 4870, 5770, 7950, 9000, 9800 Gigabyte : Electronics