The main ASIC heatsinks are only one part of the cooling system. Because the NerdOctaxe combines multiple ASIC chips on one board, the voltage regulators, power-delivery components and rear of the PCB also require airflow.
Keep both the front and rear airflow paths clear, prevent hot exhaust from returning to the intake and regularly remove dust from the fans and heatsinks. Monitor ASIC temperatures, VRM temperatures, hardware errors and fan speed rather than relying on a single temperature reading.
If the ASIC temperatures appear normal but the miner develops power errors or instability, the voltage-regulator area and power system should also be checked. Adding heatsinks, replacing fans or converting the unit to liquid cooling may affect airflow, electrical load and warranty coverage, so modifications should be confirmed with UStarMiner before installation.