A few questions:
1. Now I know that the Antminer S1 can be underclocked to 170W. Would this result in a quieter machine or would it still sound exactly the same?
2. Are newer generations of the Antminer S series any quieter?
3. Is there such thing as a quiet and powerful miner? I know that USB miners can mine completely silently but they aren't powerful enough to be profitable even with free electricity. Preferably, I would like something with either small fans (think of the fans that you'd find in a typical PC) or entirely passive cooling.
And before anyone says that mining isn't worth it. Well, I have free electricity.
We have some S1s underclocked/volted I think about 130W, some of them actually sit there with the fan off most of the time, then they barely bump it into spinning but it never breaks a few hundred RPM before shutting off again. You have to tune it a bit for stability, but it is darn near silent. If you underclocked them much more you could probably stand them on end and take the fan right off.
Other than that... I've been impressed by the RBox from Rockminer, it is also pretty quiet.
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novak