Gen3 is dead. We need a gen5 chip from AM. Other chips have twice the efficiency and AM is having trouble getting the price at a competitive price point. At .5BTC/TH we could move some product, otherwise we need ot look at the pipeline.
Which chip? Bitmain's 28nm chip reach 0.58 W/G while S3 's efficiency is just 0.77 W/G.