Temperature & Fans
LuxOS provides three user-customizable temperatures that drive different actions in the miner.
Temperatures reported by LuxOS are hashboard temperatures and shall not be confused with chip temperatures. For most S19 series miners, stock and other alternative aftermarket firmware's estimate chip temperatures by adding ~15C to the hashboard temperature sensors readings. Since chip temperatures are estimations, LuxOS shows hashboard temperatures only.
Most miners will have 4 temperature sensors per hashboard, although there are a few exceptions of miners coming with 2 temperature sensors per hashboard. LuxOS makes decisions based on the highest reading across all hashboard temperature sensors.
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Target Temperature: Used for the fan algorithm. Once the maximum temperature reading reaches the Target Temperature threshold fan speeds will be set to 100% unless the LuxOS fan algorithm is overridden with Manual fans settings.
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Hot Temperature: Used by ATM (Advanced Thermal Management) to drive steps up and steps down in profiles.
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Dangerous Temperature: When any of the temperatures in a hashboards reaches this temperature the hashboard will be shutdown to prevent damage.
| Temperature Setting | Default | Fiber Glass Hashboards | Aluminium Hashboards |
|---|---|---|---|
| Target Temperature | 55C | 55C | 55C |
| Hot Temperature | 65C | For units with ATM enabled and if the user wants to experience less underclocking then increase this setting. | To preserve the lifespan of the miner we don't increasing the hot temperature for sustained periods of time. |
| Dangerous Temperature | 70C | Maximum of 75C, ideally a 5C buffer from your Hot Temperature for ATM to have enough room to cool-down a miner before it shuts down due to high temperatures. | Maximum of 72C, ideally a 5C buffer from your Hot Temperature for ATM to have enough room to cool-down a miner before it shuts down due to high temperatures. |
Automatic Fan Control
LuxOS provides a fan algorithm that automatically adjusts fan speeds based on the temperature of the miner. The fan algorithm is designed to keep the miner at the target temperature set by the user. LuxOS reads temperatures from the temperatures sensors once every seconds and adjusts fan speeds accordingly.
The following scenarios have a different fan behavior:
- If temperatures can't be read from any temperature sensor, the PSU is enabled and at least one hashboard is detected (regardless if it's enabled or disabled), fans will be set to 100% for safety reasons.
- If temperatures can't be read from any temperature sensor, the PSU is disabled or no hashboard is detected, fans will be set to 20%.
- If the miner is curtailed, fans will be set to 20%.
Manual Fan Control
If users wish to override the automatic fan control, they can set the fans to a specific percentage. In this scenario, LuxOS won't adjust the fan speed dynamically based on temperature. We suggest keeping the fans set to Automatic mode for the best performance and longevity of the miner. If immersion mode is enabled, all fans will be disabled entirely.
Cold Start
Warming up miners correctly is crucial for a reliable start up, and for improved LuxOS Autotuner performance in cold environments. Miners that are excessively cold and don't warm up properly won't hash or tune as well as properly warmed-up miners.
To tackle warming up miners, LuxOS will first attempt to bring all hashboards to a similar temperature. This is accomplished by first running the fans at 100% for a period of time to equalize the temperature across all boards. Once this has been completed, if the environmental temperature is cold enough, then profile voltage will be ramped up to bring chips and boards up to temperature evenly. This will ensure a more consistent and efficient ramp for the miner.