Asrock ad2550ru3s3 用户手册

Select [Disabled] for better system stability.

This allows you to set the power state after an unexpected AC/
power  loss. If [Power Off] is selected, the AC/power remains off 
when the power recovers. If [Power On] is selected, the AC/power 
resumes and the system starts to boot up when the power recov-
ers.

This allows you to enable or disable the Onboard LAN1.

This allows you to enable or disable the Onboard LAN2.

Select [Auto], [Enabled] or [Disabled] for the onboard HD Audio 
feature. If you select [Auto], the onboard HD Audio will be disabled 
when PCI Sound Card is plugged.
Front Panel

  Select [Auto] or [Disabled] for the onboard HD Audio Front Panel

.

*

Onboard HD Audio is designed only for AD2550RA/U3S3.