1.10.1 Rear panel connectors Asus prime Asus M3A78

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ASUS M3A78

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Refer to the audio configuration table for the function of the audio ports in 2, 4, 

6, or 8-channel configuration.

Audio 2, 4, 6, or 8-channel configuration

10.  USB 2.0 ports 1 and 2. These two 4-pin Universal Serial Bus (USB) ports 

are available for connecting USB 2.0 devices.

11.  USB 2.0 ports 3 and 4. These two 4-pin Universal Serial Bus (USB) ports 

are available for connecting USB 2.0 devices.

12.  COM port. This port is for pointing devices or other serial devices.
13.  Optical S/PDIF Out port. This port connects an external audio output device 

via an optical S/PDIF cable.

14.  USB 2.0 ports 5 and 6. These two 4-pin Universal Serial Bus (USB) ports 

are available for connecting USB 2.0 devices.

Ensure that the audio device of Sound playback is VIA High Definition 

Audio (the name may be different based on the OS). Go to Start > 

Control Panel > Sounds and Audio Devices > Sound Playback to 

configure the setting.

Port

Headset 

2-channel

4-channel

6-channel

8-channel

Light Blue

Line In

Line In

Line In

Line In

Lime

Line Out

Front Speaker Out

Front Speaker Out Front Speaker Out

Pink

Mic In

Mic In

Mic In

Mic In

Orange

Center/Subwoofer

Center/Subwoofer

Black

Rear Speaker Out

Rear Speaker Ou

Rear Speaker Out

Gray

Side Speaker Out