ASUS P9X79LE User Manual

ASUS P9X79 LE

2-21

Clear RTC RAM (3-pin CLRTC)
This jumper allows you to clear the Real Time Clock (RTC) RAM in CMOS. You can 

clear the CMOS memory of date, time, and system setup parameters by erasing 

the CMOS RTC RAM data. The onboard button cell battery powers the RAM data in 

CMOS, which include system setup information such as system passwords.

Except when clearing the RTC RAM, never remove the cap on CLRTC jumper default 

position. Removing the cap will cause system boot failure!

To erase the RTC RAM:

1. 

Turn OFF the computer and unplug the power cord.

2. 

Move the jumper cap from pins 1-2 (default) to pins 2-3. Keep the cap on pins 2-3 for 

about 5-10 seconds, then move the cap back to pins 1-2.

3. 

Plug the power cord and turn ON the computer.

4. 

Hold down the <Del> key during the boot process and enter BIOS setup to re-enter 

data.

• 

If the steps above do not help, remove the onboard battery and move the jumper 

again to clear the CMOS RTC RAM data. After the CMOS clearance, reinstall the 

battery.

• 

You do not need to clear the RTC when the system hangs due to overclocking. For 

system failure due to overclocking, use the C.P.R. (CPU Parameter Recall) feature. 

Shut down and reboot the system so the BIOS can automatically reset parameter 

settings to default values.

• 

Due to the chipset behavior, AC power off is required to enable C.P.R. function. You 

must turn off and on the power supply or unplug and plug the power cord before 

rebooting the system.