SAPPHIRE R9 280X 3G GDDR5 Video Cards 384bit GDDR5 Graphics
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
VisionTek ATI Radeon R9 280X 3GB GDDR5 384-Bit Graphics Dual-Slot Video Card | eBay
AMD Radeon R9 280X - NotebookCheck.net Tech
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