Pinout for the motherboard fan connector of an HP ML350 G6 server
|1 (Green)||PWM||PWM Signal|
|2 (Yellow)||RPM||Fan Tachometer|
|3 (Red)||+12V||Fan Power|
|4 (Black)||Ground||Fan Ground|
|5 (Black)||Sensor||HP Installation Sensor|
Pin 5 is looped back to pin 4 and is required to install aftermarket fans in this server. Without this, the server will throw a self-test error and refuse to boot because it will detect a cooling solution failure.