Connecting the Cable
You can see the SPDIF In connector present on some GeForce video cards in Figure 5.
In order to use this connector you will need two things, a small cable, which will be used to connect the SPDIF out connector from your sound card or motherboard to the video card, and a DVI-to-HDMI adapter, to convert one of the DVI connectors from your sound card into HDMI.
First you need to locate on your motherboard or sound card a connector called “SPDIF Out” or similar, see Figure 7.
Then connect the cable. The cable has two wire, one black (ground) and another with a different color (red in our case), which is used to transmit SPDIF data. You connect each wire to the corresponding pin. This information can be seen on the board manual or at the board itself. If you pay close attention to the connector in Figure 7 you will see that pin 1 is labeled “VCC,” pin 2 is labeled “SPDO” (which means “SPDIF Out”) and pin 3 is labeled “GND.” So in our case we need to connect the red wire to pin 2 and the black wire to pin 3. Pay attention because the meaning of each pin can vary according to the board.
The next step is simple: connect the other end of the cable on the video card and your system will be sending digital audio to the HDMI connector.