What pin-configuration do Noctua products use? 

All Noctua 24V, 12V and 5V fans, fan controllers, cables and other accessories such as Low-Noise Adaptors use the same standard pin-assignment that has been specified by Intel and AMD: 

Pin configuration of Noctua 12V fans: 

Pin configuration of Noctua 24V fans: 

Pin configuration of Noctua chromax fans: 

Pin configuration of Noctua 5V fans: 

If you are looking for information regarding the implementation of PWM (Pulse Width Modulation) speed control in Noctua 4-pin PWM fans, please see our PWM specification white paper.