Gigabyte GA-P31-ES3G User Manual page 70

The pictures to the right show the 7.1-channel speaker
configurations.
Step 2:
Click the Audio I/O tab. In the speaker list on the
left, select 2CH Speaker, 4CH Speaker, 6CH
Speaker, or 8CH Speaker according to the type of
speaker configuration you wish to set up.
Step 3:
Everytime you connect an audio device to an audio
jack, the Connected device box appears. Select
the device according to the type of device you connect.
Then click OK to complete the configuration.
GA-P31-ES3G Motherboard
7.1-Channel Speakers:
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Front Speaker Out
Rear Speaker Out
Center/Subwoofer
Speaker Out
Side Speaker Out