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
ASUS Radeon R9 280X Video Card R9280X-DC2T-3GD5 - Newegg.com
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Amazon.com: Asus AMD Radeon R9 280X 3GB GDDR5 2DVI/4DisplayPort PCI-Express Video Card (R9280X-DC2T-3GD5-V2) : Electronics
Refurbished: SAPPHIRE Radeon R9 280X 100363-4L 3GB 384-Bit GDDR5 PCI Express 3.0 CrossFireX Support Video Card Tri-X OC version - Certified Refurbished - Newegg.com