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Undervolt & overclock basics for ASIC miners

Undervolt and overclock profiles can improve ROI, but they also increase risk. This guide explains the core concepts and a safe tuning approach.

Core concepts

Undervolt reduces power draw while aiming to keep hashrate stable. Overclock increases hashrate but also heat and failure risk.
Many custom firmwares offer preset profiles (efficiency / balanced / performance) and autotune.
  • Start with efficiency profiles, especially with expensive electricity.
  • Don’t push high power without cooling headroom.

A safe tuning workflow

Tune in small steps and validate stability after each change.
Track: hashrate, watts, temperature, fan RPM, HW error rate and reject rate.
  • Change one parameter at a time (power limit → frequency).
  • If errors rise, back off and increase cooling or lower frequency.
Autotune guideMonitoring guide

When not to tune

Avoid aggressive tuning on unstable power, poor ventilation, or when hardware is already degraded.
If you operate a farm, prioritize uptime over peak hashrate.
  • Don’t tune during heat waves without monitoring.
  • Never tune right after a firmware update; stabilize first.

FAQ

Is undervolting always better?
Not always. Each miner batch differs. Undervolting can reduce hashrate or increase errors if pushed too far.
What is autotune?
Autotune searches for stable voltage/frequency combinations per chip or per board to optimize for a target power/efficiency.
Does tuning affect warranty?
It can. Check your manufacturer’s policy and your firmware vendor’s notes.