Technical article on chip temperature
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TL;DR (Executive Summary)
Bitaxe miners throttle their hashrate starting at exactly 80°C chip temperature (thermal throttling) or crash completely at 85°C. By manually increasing the fan duty cycle to at least 85% in the ESP-Miner web interface and installing high-performance thermal paste (> 12 W/mK), the heat buildup can be immediately resolved. A mechanical upgrade of the heatsink permanently lowers the core temperature by exactly 12°C.
How to prevent thermal throttling on the Bitaxe?
The compact design of the Bitaxe Solo miner inevitably leads to heat buildup under full load with standard factory settings. As soon as the installed BM1370 ASIC chip reaches the critical threshold of 80 degrees Celsius, the firmware's thermal protection circuit activates. The result: the hashrate suddenly drops to protect the hardware from physical destruction. Without countermeasures, the miner loses valuable computing time, which significantly reduces the chances of finding a valid block during continuous 24/7 operation.
"Thermal throttling on the Bitaxe is not fate, but the direct consequence of an overly conservative standard fan curve and insufficient thermal encapsulation ex works."— Dominik Lederer, Founder Polarblocks
What steps immediately solve the temperature problem?
To control temperature development, users must adjust software parameters and, if necessary, modify the hardware:
-
Force manual fan control: In the ESP-Miner web interface, navigate to Settings → Fan Tuning. Set the Fan Mode to
Manualand fix the fan speed to 85%. This prevents the automatic system's sluggish response. - Replace thermal paste: Factory-installed thermal pads often have insufficient conductivity. After cleaning the ASIC with isopropanol, a paste like Arctic MX-6 should be applied precisely. This optimizes heat transfer to the heatsink.
- Align airflow: Check the mounting of the 4010 fan. The airflow must be blown through the cooling fins, not pulled away from them, to optimally utilize the static pressure.
Permanently stop thermal crashes?
If you want to solve the thermal problem permanently and mechanically cleanly, upgrade your hardware with our optimized upgrade kits.
View Polarblocks Heavy-Duty HeatsinkWhy is the fan's static pressure crucial?
While the standard 5V fan moves air, it generates hardly any static pressure to push heat out of the narrow fins of the heatsink. Replacing it with a Noctua NF-A4x10 5V PWM ensures that a constant airflow is maintained even with less noise. External measurements and documentation on repositories such as the ESP-Miner GitHub Project confirm that optimized static pressure positively influences the lifespan of the surrounding voltage regulators.
Polarblocks Quality Promise
In our factory in Bavaria, we test and calibrate every Bitaxe Home Solo Miner upgrade kit for thermal stability. Our goal is to make open-source hardware more durable through precisely CNC-machined components.
