GamingWorm says :
The Radeon R9 280X is a high end GPU by AMD. Basically it's rebranded HD 7970 and performance wise equal to HD 7970 GHz.
The GPU offers very cheap price and have the muscle to best any game. Even very demanding games can be maxed out using 1080p resolution. In some cases like Crysis 3 and Metro LL where settings have to be reduced a bit only Anti-Aliasing.