"At FullHD the GTX 980 Ti is on average 9% quicker than the FuryX and at 1440p and 2160p (UHD) the difference is 4% and 3%, respectively. Averaging the three resolution values results in a 5.5% advantage towards the GTX 980 Ti, which is basically not visible. It's also interesting to observe that at FullHD the gap between the GTX 980 Ti and the FuryX is a bit bigger than at UHD. Apparently the AMD card is becoming stronger the higher the resolution and detail levels are, which is the case due to the extremely well performing HBM (High Bandwidth Memory) memory."
Marc Buchel - OCAholic.
Nvidia GeForce GTX 980 Ti vs AMD Radeon R9 FuryX comparison on OCAholic - Introduction & Conclusion.