Gigabyte GA-8ICMT User Manual page 25

S ) PWR_JP3 (Front USB power source jumper)
T ) JP3 ( (Clear CMOS Function)
You may clear the CMOS data to its default values by this jumper.
Default value doesn't include the "Shunter" to prevent from improper use this jumper.
To clear CMOS, temporarily short 1-2 pin.
1
1-2 close:Standby 5V (Default)
1
2-3 close: 5V
1
1-2 close: Normal
1
2-3 close: Clear CMOS
2 5
Jumper Setting