With Braiins OS+ autotuning feature it is really easy to get optimal results not only for higher hashrate, but for better efficiency at a lower power usage as well. We did a quick test to see how good it works and what results can we get trying to optimize power usage while retaining the best possible hashrate. So in about 3 hours we managed to get about 10.4 TH/s for 800W of power usage from a single Antminer S9. That is about 77 Watt per THS which is not bad result for just setting the 800W power target and let the firmware do the rest automatically, but going somewhere between 700W and 800W of power usage should be the sweet spot of about 75W or even a bit less per Terahash of hashate. Of course results can vary from miner to miner, can also be affected by the cooling and so on, but it won’t hurt to try. Do note however that the Braiins OS+ and the autotuning feature do come at a cost as there is a 2% built-in development fee.