i get it, but it really depends on what games and at what resolution you play. in arma3 at 4k it is faster than a gtx 980, according to the toms review. same for battlefield 4 it is just 1 fps slower than a gtx 980. i do not like to use 1080p for these types of cards as it gets to be kid of pointless.
anyways all of these cards are withing 10% of each other or so.