Playing devils advocate here for a minute:   

What happens if the controller dies/ loose connection to usb hub/ or just plain human error enables the BTC mode while the units are hashing away on LTC mode without a fan.

1) will they stay in that mode and keep hashing away?
2) if power cycled and the controller does not send the disable BTC command (bad controller, or loose cable), does the Gridseed come back up in double mode and burn itself up?   Any idea how long it can survive in this mode ?
3) Same scneario as #2, but we throw in the human error factor.  Say a user accidently enables duel mode.  How long do you have to find your error, and fix it before your $3,000 set of 10 Gridseeds decide to let the smoke out of their IC's?


Just seems like high risk to run without a fan until there is a firmware release that allows you to permanetly shut off the BTC function in firmware vs relying on a command from the controller to disable it when power cycled.

But I guess no one should worry as software never has a bug, cables and controllers never go bad, and humans never make mistakes......... right?