ROI ASIC / Knowledge base / Presets and J/TH: how efficiency actually raises margin
Presets and J/TH: how efficiency actually raises margin
Undervolting cuts watts faster than hashrate, so the power bill drops more than output - that is the margin.
The efficiency preset lowers chip voltage: on an S21 Pro, power drops about 16% while hashrate drops only about 4%.
Energy per terahash (J/TH) falls from 15.0 to 13.1. At $0.08/kWh that lifts daily margin by roughly 14%.
The maximum preset does the opposite - more hashrate for peak-price hours. Rollback to stock is always one click away, so testing costs nothing.