回答
SPDIF(Sony/Philips Digital Interface) 是一种数字格式，用于PC音频卡，CD播放机，DVD播放机和其他设备发送或接收数字音频信号．如果您的主板有SPDIF端品，您可以连接到您的计算机等数字音频输出设备． SPDIF有二种输出连接：光纤和同轴电缆．下图为SPDIF针脚定义供您参考．
If external graphics card support SPDIF in with two pins, please also make sure graphics card's pins definition. Then connect the two cables as following to support this funciton.
1. SPDIF out from MB Pin#1 to SPDIF in to graphics.
2. Ground (GND) from MB Pin#4 to graphics Ground.
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