Hawaii will go down in GPU history one of the best GPUs in terms of longevity. Sadly due to AMD's poor execution at R9 290/R9 290X at launch with the ref cooler, the bitcoin mining rush and other issues such as power inefficiency wrt Maxwell and the DX11 CPU overhead this GPU could never match the market success of 780/780Ti and 980/970.
Hawaii/Grenada on ITX envelope with power gating a la Nano. YOU HAD ONE JOB AMD!
Seriously, I know the board would have been totally cramped to fit a 512 bit GDDR5 design with many VRM phases, but that card would have neutered the reason to give us the Nano and air cooled Fury. The Gigabyte WFx2 design is the shortest out of the bunch and it shows I could have been doable.