As a Blast form the Past, here is the link to the original How to undervolt an s1 https://bitcointalk.org/index.php?topic=526060.msg5838713#msg5838713 Dropped them from 1.19w/GHs to an amazing 0.89w/GHs Compare that to today's >7-8x lower efficiency. Woof!

Thought about doing it to the dozen s1's I had back then but -- each board had 4 regulators to tweak by hand and x2 per miner x12 miners.... just not worth my time to bother with.

Now with the s9 and 1 tweak per board and then only as-needed -- thass a while 'nother story. Thx for the info.