AMD R9 270X Review
The 270X struggles to produce decent numbers in CatZilla, regardless of the resolution used. The GTX760 comprehensively bests it, and even the old GTX650Ti isn't far behind.
Unigine Valley is another test which doesn't show the 270X in a good light, or at the least demonstrates that the GTX760 has more potential for decent frame rates. Even the difference between the 280X and the 270X are like night and day.