Fans

The Fans page is where you set up each header individually — names, curves, safety limits, and calibration. For quick day-to-day adjustments, the tray flyout is usually faster; see Profiles.

Modes

Each fan is independently set to one of three modes:

• Auto — hands the header back to your motherboard’s own BIOS/firmware control.
• Fixed — a constant speed, adjusted live as you drag the slider (no separate Apply step).
• Curve — speed follows a curve you draw against a temperature source. See Curves.

Minimum speed and the pump flag

Every fan has a minimum percent floor — it never runs below this, in Fixed or Curve mode, even at the curve’s own lowest point. If the header actually drives a liquid-cooling pump rather than a fan, check Pump: the service then enforces a 20% floor regardless of what the minimum above is set to, since a pump stalling is a different kind of problem than a case fan stalling.

Naming and hiding headers

Motherboards report fan headers as generic names like “Fan #3,” which means nothing without opening the case. Rename each one to whatever it actually cools — front intake, rear exhaust, whatever you have. Headers that read 0 RPM at every duty (nothing plugged in) are hidden automatically.

Calibration

Calibrating a fan sweeps it from 0% to 100% and back, about 45 seconds, to measure its real start duty, stop duty and max RPM — the actual points where it starts spinning, stops spinning, and tops out, rather than assumed defaults. This feeds the stall warning (a fan that should be spinning above its start duty but reads 0 RPM) and is worth doing once per fan after a fresh install.