Asus P4C800-E - Manual (Page 46)

2-20 Chapter 2: Hardware information
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
BIOS can automatically reset parameter settings to default values.
1. The USB device wake-up feature requires a power supply that can
provide 500mA on the +5VSB lead for each USB port. Otherwise,
the system would not power up.
2. The total current consumed must NOT exceed the power supply
capability (+5VSB) whether under normal condition or in sleep
mode.
3. USB device wake-up (3-pin USBPW12, USBPW34, USBPW56,
USBPW78)
Set these jumpers to +5V to wake up the computer from S1 sleep
mode (CPU stopped, DRAM refreshed, system running in low power
mode) using the connected USB devices. Set to +5VSB to wake up
from S3 and S4 sleep modes (no power to CPU, DRAM in slow
refresh, power supply in reduced power mode).
The USBPWR12 and USBPWR34 jumpers are for the rear USB ports.
The USBPWR56 and USBPWR78 jumper is for the internal USB
header that you can connect to the front USB ports.
P4C800-E
®
P4C800-E Clear RTC RAM
CLRTC
Normal Clear CMOS
(Default)
1 2 2 3
P4C800-E
®
2 1
+5V
(Default)
2 3
+5VSB
3 2 2 1
+5V
(Default)
+5VSB
+5V
(Default)
+5VSB
1
2 2
3
P4C800-E USB Device Wake Up
USBPW12
USBPW34
USBPW78
USBPW56