Dual link DVI is necessary for 120Hz
DVI-I carries analog signal with digital
DVI-D is only digital signal.http://en.wikipedia.org/wiki/Digital_Visual_Interface
That link will explain a lot.
Ah ok, so if I want to run this monitor at 120hz I'll have to buy the SAPPHIRE Vapor-X 100352VXSR card, the other won't work?