edit: brainfart.

Those chips are 28nm chips, just like coincraft A1. Nothing old about them, they arent even on the market yet. As for power consumption a little under 1W/GH at the wall is in line with all the other 28nm chips, and that probably includes coincraft A1 which is specced at 0.6W/GH at the chip level. Its not because AMT seems to think it will somehow be lower at the wall than what the chip is specced for, that you should bet a lot of money on that.