Looking forward to the test runs.
Not sure how far out we are from an A9, these are just an optimized version of the 841, and from what you have on the label it looks like just that. I wonder if the voltage settings will work the same as they did for the 841 for this model.
I don't think Canaan will be going the integrated PSU route again, sounds like the 761's were a disaster to deal with. Personally I'd rather source my own PSU anyways.
I don't mind not having the built in psu which would have been a 861 I found info on it.
The 851 simply appears to hash at 14.5 th and 1450 watts
It did not work chained to the 841 chain
but the new rasp pi arrives today should have this running soon