P55 FTW: Internal SPDIF audio pin assignment? (passthrough to HDMI with nVidia Gfx)
9600GT S/PDIF connection cable | guru3D Forums
DVD Internal Digital Audio Cable 2 Pin SPDIF with Clip 24 AWG
Amazon.com: MakerSpot Accessories - 2-Pin RCA (Composite Video, Audio, Coaxial S/PDIF) Female Jack Cable Dongle Adapter, Connect Pi 3 / Pi Zero W to Display Without HDMI Monitor : Electronics
2-Pin/2-Pin SPDIF Audio Cable Video Graphics | eBay