RetroLizard wrote on Today, 02:56:

For anybody who has a Radeon X850: what is the weird circled connector for? It looks like something you would find on a sound card for things like CD_IN.

On ATI X series cards with VIVO chip, this connector is used to connect composite video input from the front panel on the case, if the PC is equipped with it. You could thus record video from, for example, a camera for further processing in a PC.