AMD Radeon R9 280X Video Card Review w/ ASUS, XFX and MSI - Legit Reviews
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 Graphics Card R9280X-DC2T-3GD5 B&H Photo
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