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