CLUB3D RADEON R9 280X is Tahiti clocked at 1000Mhz with 3GB GDDR5 clocked at 6000mhz. Club3D Radeon R9 280x is 384bit with 2048 shaders with directx 11.2 with TDP of 250. Club3D Radeon R9 270x is Pitcairn clocked at 1080Mhz with 2GB GDDR5 clocked at 5600Mhz. Club3D Radeon R9 270x is 256bit with 1280 shaders with support for directx 11.2 with TDP of 180. Benchmark software are Battlefield 3, Bioshock Infinite, Dirt 3, Farcry 3, Hitman Absolution, Max Payne 3, Resident Evil 6 and Tomb Raider 3. CPU is AMD FX 8370E with Gigabyte GA78LMT S2P using Windows 8."