sorry, i wasn't talking about design feasibility, rather the market feasibility... what any designer would need to know is the worth of his effort... if i develop a system and people still prefer GPU's over fpga rigs, then why would i want to waste my time?... in short if i could such a system in the market, how many people would want to buy it?
well. now you only can bitcoin mining with gpu coz is the only comercial option. im bet if someone invest in stand alone or especialized external units with good specs you can earn a lot in the short place. considering the dificulty jumps and energy cost any miner with a calc find these especs very interesting. even if you cuad these energy consumption rate.