brownymasterHDMI is DVI with sound, so it should theoretically work.
EDIT:darkk-You need a dual-link DVI cable to run 120hz. Regular DVI or HDMI doesn't have enough bandwidth. Displayport can run 120hz if you have it on your laptop, otherwise you might be screwed yeah.HDMI uses the same signal as DVI for video.
http://en.wikipedia.org/wiki/HDMI
Whether or not the computer drivers can do it is what I'm not sure of, but I imagine so. Bandwidth has nothing to do with it.
Let me get this right. i can use my hdmi for 120hertz?
Just an other thing what drivers then? nvidea drivers?