Here's hoping.
they sold out of the 741's
but they have used model 6 .
I owned them they do 3500gh they cost 239 they use .3 watts
translation if you have cheap power 5 cents they are good to buy.
I don't think I have a rasp pi image burned for them. and I don't know what rasp pi works with them.
ie the new rasp pi 3 may not work.
I had older models.
fast math on the model 6 they clear about $1.75 a day with the new diff coming at 1100 price of coin at 3700