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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
Refurbished: ASUS Radeon R9 280X 3GB GDDR5 R9280X-DC2T-3GD5 Video Card GPU - Newegg.com