The GTX 980 averaged 53fps at 2560x1600 in Thief and through overclocking the HIS R9 290X Hybrid IceQ became just 6% slower. The overclocked R9 290X Hybrid IceQ was 14% faster than a standard R9 290X and GTX 780 Ti.
Finally we have Watch Dogs and here the overclocked HIS R9 290X Hybrid IceQ was 13% faster than a standard R9 290X and 18% faster than the GTX 780 Ti, though it was 10% slower than the GTX 980.