ASUS P4S8X-X motherboard user guide
1-15
1.11
Jumpers
1. USB device wake-up (3-pin USBPWR12, USBPWR34, USBPWR56)
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 sleep mode (no
power to CPU, DRAM in slow refresh, power supply in reduced power mode).
Both jumpers are set to pins 1-2 (+5V) by default because not all computers
have the appropriate power supply to support this feature.
The USBPWR12 and USBPWR34 jumpers are for the rear USB ports. The
USBPWR56 jumper is for the internal USB header that you can connect to the
front USB ports.
P4S8X-X
®
P4S8X-X USB Device Wake Up
USBPW12
USBPW34
USBPW56
+5V
(Default)
1 2
+5VSB
3
2
1
2
+5V
(Default)
3
2
+5VSB
1.
This feature requires a power supply that can provide at least 1A on the
+5VSB lead when these jumpers are set to +5VSB. 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.
2. Keyboard power (3-pin KBPWR)
This jumper allows you to enable or disable the keyboard wake-up feature. Set
this jumper to pins 2-3 (+5VSB) if you wish to wake up the computer when you
press a key on the keyboard (the default is the Space Bar). This feature
requires an ATX power supply that can supply at least 1A on the +5VSB lead,
and a corresponding setting in the BIOS (see section 2.5.1 Power Up Control).
P4S8X-X
®
P4S8X-X Keyboard Power Setting
KBPWR
(Default)
+5V
1 2
+5VSB
2 3
