GIGABYTE RADEON R9 280X Gigabyte Radeon R9 280x is Tahiti clocked at 1000Mhz with 3GB GDDR5 clocked at 6000mhz. Gigabyte Radeon R9 280x has memory interface of 384bit with 2048 shaders with directx 11.2 with TDP of 250. Gigabyte Radeon R9 270x is Pitcairn clocked at 1020Mhz with 2GB GDDR5 clocked at 5600Mhz. Gigabyte Radeon R9 270x has memory interface of 256bits with 1280 shaders with directx 11.2 with TDP of 180. Benchmarks for testing Gigabyte Radeon R9 280x and Gigabyte Radeon R9 270x are as follows:- Battlefield 3, Bioshock Infinite, Dirt 3, Farcry 3, Hitman Absolution, Max Payne 3, Resident Evil 6 and Tomb Raider 3. CPU is AMD FX 8350 with Gigabyte GA78LMT S2P using Windows 8."