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1.9 Jumpers
Clear RTC RAM (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 reenter
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 clearing the CMOS, 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 CPU Parameter Recall (C.P.R) feature. Shut
down and reboot the system so the BIOS can automatically reset parameter settings to
default values.
• In single VGA card mode, use the PCIe 2.0 x16_1 slot (blue) for a PCI Express x16
graphics card to get better performance.
• We recommend that you provide sufcient power when running CrossFireX™ mode.
See page 1-20 for details.
• Connect a chassis fan to the motherboard connector labeled CHA_FAN1/2 when using
multiple graphics cards for better thermal environment.
• In CrossFireX
TM
mode, use the PCIe 2.0 x16_1 and PCIe 2.0 x16 _2 slots for PCI
Express x16 graphics cards to get better performance.
• The PCIe x16_3 slot shares bandwidth with PCIe x1_2 slot. Due to the CrossFireX
TM
limitation, DO NOT use the PCIe x1_2 slot when you install two CrossFireX
TM
graphics
cards on both the PCIe x16_1 and PCIe x16_3 slots to set up a CrossFireX
TM
conguration.
F1A75-V EVO
F1A75-V EVO Clear RTC RAM
1 2 2 3
Normal
(Default)
Clear RTC
CLRTC
Chapter 1: Product introduction1-16