Asus P8B-X User Manual page 42

3. CPU Fan and Chassis Fan control setting
(3-pin CPUFAN_SEL1, CHAFAN_SEL1)
These jumpers allow you to switch for fan pin selection. The CPUFAN_SEL1
jumper is for the CPU fan control and the CHAFAN_SEL1 jumper is for the front
fans and rear fans control. Set to pins 1–2 when using 4-pin fans or pins 2–3
when using 3-pin fans.
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4. LAN controller setting (3-pin LAN_SW1, LAN_SW2)
These jumpers allow you to enable or disable the onboard Intel
Gigabit LAN controllers. Set to pins 1-2 to activate the Gigabit LAN feature.
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If you use a 4-pin fan but set the jumper to pin 2-3, the fan you installed may
not work.
If you use a 3-pin fan but set the jumper for a 4-pin fan, the fan control will not
work and the fan you installed will always run at full speed.
82574L
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Chapter 2: Hardware information