ASUS announces Radeon R9 280X, 270X and 260X DirectCU II | VideoCardz.com
ASUS Radeon R9 280X Video Card R9280X-DC2T-3GD5 - Newegg.com
Asus Radeon R9 280X DirectCU II Top Unboxing & Review (3GB) | Unboxholics - YouTube
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