Asus a7n8xx A7N8X-X User's Manual - Page 20

1.9 1. Jumpers USB device wake-up (3-pin USBPWR_12,USBPWR_34,USBPWR_56) 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 USBPWR_12 and USBPWR_34 jumpers are for the rear USB port. USBPWR_56 is for the internal USB header that you can connect to the front USB ports. This feature requires a power supply that can provide at least 2A on the +5VSB lead when these jumpers are set to +5VSB. Otherwise, the system does not power up. The total current consumed must NOT exceed the power supply capability (+5VSB) whether under normal condition or in sleep mode. USBPWR_12 USBPWR_34 1 2 +5V (Default) 2 3 +5VSB This section describes and illustrates the jumpers on the motherboard. USBPWR_56 ® A7N8X-X 1 2 +5V (Default) 2 3 +5VSB A7N8X-X USB Device Wake Up 2. Central Processing Unit FSB (CPU_FSB) This jumper when set to 1-2 pins (default), enable support for Front Side Bus 400/333/266. When set to pins 2-3, it sets support for FSB 200 only. CPU_FSB 1 2 ® 2 3 FSB200 A7N8X-X FSB400/333/266 (Default) A7N8X-X CPU FSB Jumper Setting 1-10 Chapter 1: Motherboard Information