Asus P5B-MX P5B-MX user's manual - Page 46
pin CPU_FAN, 3-pin CHA_FAN - p5b max cpu
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7. CPU and chassis fan connectors (4-pin CPU_FAN, 3-pin CHA_FAN) The fan connectors support cooling fans of 350 mA ~ 2000 mA (24 W max.) or a total of 1 A ~ 7 A (84 W 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. Do not forget to connect the fan cables to the fan connectors. Insufficient air flow inside the system may damage the motherboard components. These are not jumpers! Do not place jumper caps on the fan connectors! CPU_FAN CPU FAN PWM CPU FAN IN CPU FAN PWR GND CHA_FAN Rotation +12V GND P5B-MX/WiFi-AP Fan Connectors Only the CPU-FAN and CHA-FAN connectors support the ASUS Advanced Q-Fan feature. R P5B-MX/WiFi-AP 1-34 Chapter 1: Product introduction