AMD Radeon R9 280X OC 3GB Graphics Video Card Apple Mac Pro 1,1-5,1 *Monterey 4K | eBay
MSI R9 280X GAMING 3GB 384-bit GDDR5 PCI Express 3.0 HDCP Ready CrossFireX Support Video Card GPUs / Video Graphics Cards - Newegg.com
The Sapphire R9 280X Toxic Review
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