LordCanti said:I would think that HDMI can do it (HDMI has a lot of bandwidth) but I can't be sure. Only one way to find out.
DVI definitely doesn't have audio though. It seems like the monitor will output via the green port on the back when HDMI audio is coming in, but I can't be sure without the monitor in front of me.
my geforce GT210 in htpc did audio over DVI when utilizing a DVI->HDMI cable to my receiver ... not sure if my GTX480 does as well, but technically it's not strange since DVI has the same pins as HDMI
question will be if his Dell monitor decodes the audio from HDMI into 2 channel stereo

edit: incoming DVI on monitor won't have sound ofcourse
