well, the GPU scores and such are never usually accurate, I was on nova bench and my Gigabyte Windforce 3X OC R9 290X OC'd to 1250MHz on the GPU Clock was being beaten by a GTX 680 Stock un-OC'd in 3D FPS, by about 200 when my card got 1500. That is outrageously wrong and there is no chance in hell that the GTX 680 would beat it, so don't base the performance by the performance test scores, their not always right.
-And by the way, in gaming my card achieved much higher FPS, just given worse off scores.