The cables are different. Don't buy DVI adaptors as a substitute for a DVI cable. All the DVI adaptors do, is allow you to use the DVI output on your video card with a standard VGA cable. It DOES NOT provide a digital output. The wires in a DVI cable are completely different from a VGA cable, so don't waste your money on an adaptor. It's not a cheap fix. Buy the cable. My ViewSonic is a widescreen display, so the DVI connection is a definite plus for me.
Robert