There is a thread with a lot of info on how to undervolt and underclock an s-1.  Right now diff and power do not call for the mod.


https://bitcointalk.org/index.php?topic=526060.0

  this thread describes a how to  that achieved  140gh and 160 watts.


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If you have a look at the specs of the BM chip you will see that thoose numbers does not add up, @140GH it will use +180W! I have one running 0.86V 250M, it gives 128GH and 164W at the wall.