Gigabyte GA-X99-UD4, User Manual, Page: 26 / 128

- 26 - Hardware Installation
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.
Pin No. Definition
1 GND
2 Speed Control
3 Sense
4 VCC
DEBUG PO
RT
G.QBOFM
1
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.
Pin No. Definition
1 VCC
2 GND
1
CPU_OPT