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
AMD Radeon R9 270 Specs, Benchmarks, & Price - A New Mid-Range GPU | GamersNexus - Gaming PC Builds & Hardware Benchmarks