I used to have a dead HIS IceQ Radeon HD 4670 AGP card in collection. I always thought it was neat that the HDMI output on the card could transmit audio, since sending audio data over the AGP bus sounds like black magic. I noticed there was a jumper on the card that could disable HDMI audio output. Does anyone know why it exists? My immediate thought was for compatibility with certain motherboard chipsets, but I also wondered if it could possibility improve performance? Maybe they had to dedicate some of the pin out exclusively to audio, thus reducing data bandwidth for the graphical functions of the card? Maybe somebody smarter than me can settle my curiosity. 😀