Added to FAQ:

- I see 0% devfee for all 2GB and 3GB cards in Windows 10, my rig has some 3GB cards and some 6GB cards, how is the fee calculated in this case?
  During devfee mining 3GB cards still mine for you. How does it work? Miner creates second connection for devfee mining, main connection still works and 3GB cards still find shares for it.
  You can see these shares in the log file, all devfee shares contain "Devfee:" string, normal shares don't contain this string and 3GB cards can find them during devfee mining as well.
  Note that devfee mining takes only 36 or 54 seconds per hour so it can take many hours to find normal shares during devfee mining.