This is far below what they forecasted last month (14 TH/s @ 1300W). I was hoping we might get a little more, not 20+% less. I love Canaan, but this is making me re-think my purchase plan for next year.
I like it a lot better from the "not insane can only use server or VERY HIGH PRICE atx" power supply standpoint.
Perhaps the posted spec is a BASE spec and you can overclock to get to the 14/1300 level?
(edit) just noticed the 841 part of that one post - 13 at 1200 is pretty close to 14/1300, but I bet they have to use more chips running at lower voltage (and probably end up at a HIGHER COST) to get there vs the 821.