I think the GTX 980 can beat the Fury X in gaming if decently overclocked. Wonder which one can put out more kHashes/W though, since Maxwell is ok at mining and has much better power consumption.
The last I heard was that the Fury X barely beat the GTX 970....
Fury X @stock handily beats a GTX 980 @stock http://www.guru3d.com/articles_pages/amd_radeon_r9_fury_x_review,15.html.
Guru3d overclocked both the 980 and Fury X and if you compare the results of the 980 overclock it still loses to the Fury X @stock in the three games they used for the OC results http://www.guru3d.com/articles_pages/nvidia_geforce_gtx_970_and_980_reference_review,28.html , let alone when compared to the Fury X OC results.