At 2560x1600 the Titan X was 35% faster than the GTX 980, 57% faster than the R9 290X, but 16% slower than the R9 295X2. At 4K we find that the Titan X is 40% faster than the GTX 980 and 50% faster than the R9 290X.
The Titan X delivered a silky smooth 80fps at 2560x1600 making it just 2% slower than the R9 295X2 while it was 33% faster than the GTX 980 and 45% faster than the R9 290X. After cranking things up to 3840x2160 the Titan X was 44% faster than the GTX 980, 35% faster than the R9 290X and 16% slower than the R9 295X2.