Gigabyte GA-X99-UD4 User Manual page 26

6) CPU_OPT (Water Cooling CPU Fan Header)
The fan header is 4-pin and possesses a foolproof insertion design. When connecting a fan cable, be sure to
connect it in the correct orientation (the black connector wire is the ground wire). The speed control function
requires the use of a fan with fan speed control design.
7) LED_CON1 (I/O Shield Audio LED Power Connector)
The power connector provides power to the LEDs on the I/O shield on the motherboard back panel.
Hardware Installation
Pin No. Definition
1
2
1
3
CPU_OPT
4
Pin No. Definition
1
2
1
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GND
Speed Control
Sense
VCC
VCC
GND