You often see these. I've used them as doorstops. They lack the four analog pins that would make DVI-I, and therefore have no obvious way to work. Why do they exist? This thread suggests they're simply a con, an ebay ploy to sell nonfunctioning, technically impossible bits of plastic for profit. My own experience doesn't line up with that, because I have - from way back in the day - genuine ATi-branded ones which clearly were made to work in a specific context. I just can't fathom what it would be.