Auto Switcher — How It Works

 MAXIMUM CHIP TEMPERATURE – The hottest chip reading across all hash boards. This single value is what the switcher compares against the Raise and Decrease temperatures — if any board runs hot, the whole miner reacts.

PSU PROTECTION:

PSU Critical Temperature = 90 °C (default) .The power supply’s safety limit. All the PSU thresholds below are measured relative to this value, so if you change it, they move with it.

PSU Raise‑block=Critical − 4 °C` → 86 °C. While the power supply is this hot or hotter, the preset is not allowed to rise— there isn’t enough thermal margin to go higher.

PSU Lower= Critical − 2 °C` → 88 °C | When the power supply reaches this temperature, the preset is lowered immediately to bring the PSU back down.

PSU Critical hit = 90 °C  If the limit itself is reached, the miner triggers full overheat protection (drops the preset and raises an error) — this is the hard safety stop. 

How the PSU steps work together:

The three PSU values form a staircase that gives the power supply a safety buffer instead of reacting at a single point:

 86 °C  ─ Critical − 4 ─►  stop raising the preset

 88 °C  ─ Critical − 2 ─►  lower the preset right away

 90 °C  ─ Critical     ─►  overheat protection (hard stop + error)

So as the PSU heats up, the switcher first stops climbing (86 °C), then eases off (88 °C), and only if it still reaches 90 °C does the hard protection kick in. With the default critical of 90 °C these land at 86 / 88 / 90 °C; changing the critical value shifts all three.

When the preset will NOT change:

The preset stays where it is if:

1. The Auto Switcher is turned off.
2. A preset change is already in progress** (started manually or by the switcher).
3. Auto‑tuning is running and the miner isn’t ready to move in that direction yet.
4. The preset has reached its limit — the highest or the lowest allowed.
5. Less than 5 minutes have passed since the miner started mining.
6. Not enough time has passed since the last preset change (the configured “Check Time”).
7. (For raising only) – Less than 30 minutes have passed since the last time the preset was lowered. This prevents the miner from bouncing up and down.

When the preset is RAISED ⬆

The switcher increases the preset when the miner has room to work harder:

– The maximum chip temperature is below the Raise Temperature, so there’s thermal headroom.

– In Auto cooling mode, the fans are also running below 90% — meaning cooling isn’t maxed out yet. (If “ignore fan speed” is enabled, this fan check is skipped.)

The switcher will not raise the preset when:

– The power supply is getting **close to its temperature limit**.

– The miner is already drawing **close to its maximum power** (about 95% or more)

– the next step up could push it over the limit.

– The preset was just lowered because of power — it waits before trying again.

> If the preset somehow drops below the minimum allowed, the switcher will raise it back up.

When the preset is LOWERED ⬇

The switcher decreases the preset to protect the miner when it’s under stress:

– The maximum chip temperature reaches the Decrease Temperature.

– In Auto cooling mode, the fans hit 100% — cooling is maxed out and can’t keep up.

The chip temperature used here is always the hottest reading across all hash boards.

Immediate protection:

In some cases the preset is lowered right away, without waiting:

– ⚠️ The power supply is overheating — the preset drops immediately to keep the PSU safe and the miner running.

– ⚠️ The miner exceeds its maximum power limit— the preset is lowered to bring power back in line.

– ⚠️ The preset is above the maximum allowed — it’s brought back down.

 In short:

The Auto Switcher constantly balances performance vs. safety:

– 🔼 More headroom → push performance up.

– 🔽 Too hot or too much power → ease off to protect the hardware.

– ⏱️ Built‑in delays keep it stable, so the preset doesn’t change too often.