There are 6 types of DVI. DVI-A, DVI-D and DVI-I. They come in single (up to 1080p) and Dual Link (over 1080p). You need a dual link capable video card to use a larger than 1080p screen (common in the movie/broadcast industry as well as medical imaging systems). Some of hte larger gaming screens are also over 1080p resolutions.
DVI-A is analog, pretty much identical to vga or component. DVI-D is digital. DVI-I can be either. This is why video dvi-i is used on video cards. It doesn't matter what the dvi type is on the other side of hte wire, it'll do all 3. Now they do have different cables. DVI-D cables have different pins then DVI-A. DVI-I has both sets of pins but DVI-I Dual Link has even more pins. I order dvi-i duallink cables to avoid the concern of what type of wire I need to have and prolong its life.
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