An interesting turn of events for AMD's latest video cards has been discovered by 'TX12' from the OCN forums, where he has a universal tool that lets you unlock any Hawaii, Tonga or Fiji-based GPU to its full potential.
Some users have already managed to unlock their air-cooled Radeon R9 Fury cards to a full-blown Fury X, which requires water cooling. In the case of the Fury X, AMD disabled a number of CUs on the GPU, but this universal tool lets you unlock them and enjoy the full 4096 stream processor count from the Fury X, on your air-cooled Fury.
There are dangers of doing this, as you can completely brick your very expensive card, so use caution. The thread on the OCN forums has a full rundown of how to do it, with benchmarks and screenshots of a fully unlocked Fury to Fury X, increasing its stream processor count from 3840 to 4096.