lead is connected to 5V pin (GPIO 4 pin). GND (Black) lead is connected to Ground pin (GPIO 6 pin). PWM (Blue) lead is connected to GPIO 14 (GPIO 8 pin). However, I recommend following connection for ...

Tested with Noctua NF-A4x10 5V PWM, Raspberry Pi 4 and common small heatsinks. No extra hardware required, unless a 1N4148 diode between +3.3V(K) and the fan PWM input(A), to protect that GPIO pin. At ...