Use 40x40x20mm turbofan instead of 35x35x7mm turbofan.
The original air inlet and outlet holes were hollowed out to increase the heat dissipation effect.
The fan uses a 5V USB power supply, and the line is coupled with a 1/2W 150 ohm resistor, and the power consumption is reduced from 0.35A to 0.1A to control the fan speed to a silent level.
Prepare 0.8mm, 0.5mm and 0.3mm thermal conductive copper sheets to replace the thermal paste
Place 0.5mm and 0.8mm copper pads on the CPU and Northbridge chip
The original position of the cooling fan is replaced by a heat sink
100% cpu usage test
The first half is the case without a fan, the temperature rises to nearly 90 degrees, and the cpu clock drops to 800MHz
The second half is the case of using a fan, the temperature can be controlled close to 80, and the cpu clock returns to 2300MHz