Asus P4P800S-X - Manual (Page 26)

1-16 Chapter 1: Product introduction
2. USB device wake-up (3-pin USBPW1, USBPW2, USBPW3, USBPW4)
Set these jumpers to +5VSB 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 (+5VSB) by default because not all computers
have the appropriate power supply to support this feature.
The USBPW1 and USBPW2 jumpers are for the rear USB ports. The USBPW3
and USBPW4 jumpers are for the internal USB header that you can connect to
the front USB ports.
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.
3. The rear panel USB ports (Ports 1 to 4) do not support device wake-up
from S4 sleep mode.
P4P800S-X
®
3 2 2 1
P4P800S-X USB Device Wake Up
+5V
(Default)
+5VSB
USBPW3
USBPW4
+5V
(Default)
+5VSB
USBPW1
USBPW2
2
1
3
2