Gigabyte GA-Z77X-UD3H User Manual page 27

3) ATX4P1 (PCIe Power Connector)
The power connector provide auxiliary power to the onboard PCI Express x16 slots. When two or more
graphics cards are installed, we recommend that you connect the SATA power cable(s) from the power
supply to the ATX4P1 connector to ensure system stability.
4/5) CPU_FAN/SYS_FAN1/SYS_FAN2/SYS_FAN3/SYS_FAN4 (Fan Headers)
All fan headers on this motherboard are 4-pin. Most fan headers possess 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. For
optimum heat dissipation, it is recommended that a system fan be installed inside the chassis.
Be sure to connect fan cables to the fan headers to prevent your CPU and system from
overheating. Overheating may result in damage to the CPU or the system may hang.
headers.
Hardware Installation
1
15
CPU_FAN:
Pin No.
1
CPU_FAN
SYS_FAN1/2/3:
Pin No.
1
SYS_FAN1/SYS_FAN2
SYS_FAN4:
1
Pin No.
SYS_FAN3/SYS_FAN4
- 26 -
Pin No.
1 NC
2 NC
3 NC
4 GND
5 GND
6 GND
7 VCC
8 VCC
9 VCC
10 GND
11 GND
12 GND
13 +12V
14 +12V
15 +12V
1 GND
2 +12V
3 Sense
4 Speed Control
1 GND
2 +12V /Speed Control
3 Sense
4 Reserve
1 GND
2 +12V
3 Sense
4 Reserve