Asus A7N8X-VM 400 A7N8X-VM/400 User's Manual - Page 26

6. CPU and Chassis Fan Connectors (3-pin CPU_FAN1, CHA_FAN) The fan connectors support cooling fans of 350mA~740mA (8.88W max.) or a total of 1A~2.22A (26.64W max.) at +12V. Connect the fan cables to the fan connectors on the motherboard, making sure that the black wire of each cable matches the ground pin of the connector. CPU_FAN1 Rotation +12V GND A7N8X-VM 400 CHA_FAN1 GND +12V Rotation A7N8X-VM 400 12-Volt Cooling Fan Power Do not forget to connect the fan cables to the fan connectors. Lack of sufficient air flow within the system may damage the motherboard components. These are not jumpers! DO NOT place jumper caps on the fan connectors! 7. Chassis intrusion connector (4-1 pin CHASSIS1) This lead is for a chassis designed with intrusion detection feature. This requires an external detection mechanism such as a chassis intrusion sensor or microswitch. When you remove any chassis component, the sensor triggers and sends a high-level signal to this lead to record a chassis intrusion event. By default, the pins labeled "Chassis Signal" and "Ground" are shorted with a jumper cap. If you wish to use the chassis intrusion detection feature, remove the jumper cap from the pins. A7N8X-VM 400 CHASSIS1 +5VSB_MB Chassis Signal GND A7N8X-VM 400 Chassis Alarm Lead (Default) 1-16 Chapter 1: Product Information