1, plug the ground wire and signal on the graphics card in reverse, and generally there will be no card burning. Just don't plug 5V voltage into the SPDIF sound source of the motherboard when connecting the motherboard cable. Inserting this voltage may burn the card.

2. Old graphics cards, such as 86 series HDMI, don't output sound. You need to connect the two pins on the motherboard to the two audio pins of the graphics card, so that HDMI can output sound.

3. There is also a two-pin socket spdifout, which is connected to the graphics card and has a corresponding port. So as to superimpose the audio signal in the HDMI cable of the graphics card. I have never seen a pure digital speaker. Generally, the quality of ordinary active speakers with a conversion board is mostly poor. Why not connect the stereo to make home audio and video?

4, SPDIF, the rigorous writing should be S/PDIF, which is the abbreviation of Sony/Philips digital audio interface. SPDIF is a digital signal transmission standard. Coaxial and optical fiber are just two different transmission carriers of SPDIF signal.