Benchmarks: Battlefield 4, Thief
Starting with the budget cards we see that the R7 360 was 6% slower than the GTX 750 Ti at 1080p with an average of just 31fps. The R7 370 also lost out to the GTX 950 as it was 4% slower with an average of 45fps.
AMD got its first win in the $200 battle as the R9 380 was 5% faster than the GTX 960 with an average of 58fps. The R9 390 vs. GTX 970 battle ends in a tie as both graphics cards averaged a very playable 87fps at 1080p.
Moving to 1600p for the $400+ battles, the R9 390X was 5% slower than the GTX 980 (though it's cheaper as well), the Fury X suffered a 12% blow against the GTX 980 Ti which allowed for an average of 78fps, and the Fury X was limited to 69fps.
The R7 360 took charge in Thief at 1080p as it was 8% faster than the GTX 750 Ti with an average of just 28fps. The R7 370 was still slower than the GTX 950 though this time by just a single frame which equated to a 3% performance margin. The R9 380 pulled further ahead of the GTX 960 with an average of 55fps making it 10% faster. The R9 390 was also 8% faster than the GTX 970 and it managed an average of 77fps.
Jumping up to 1600p we see that the R9 390X was 6% slower than the GTX 980 while the GTX 980 Ti was 6% slower than the Fury X.