And because those of us that run 30" 2560x1600 rez monitors require them. A single DVI that doesn't funnel the data through that kind of bus will get saturated, and can't keep up.
1 connection, but crammed into 1 output through 2 combined ports.
What is the purpose for most of the nicer cards to have two ports?
Errr... dual-link DVI doesn't mean two DVI connectors - dual-link DVI is a connector with more pins for more bandwidth so you can actually use a monitor bigger than 1600x1200.
Two connectors on a graphics card are almost the norm nowadays - I use one for my 17" 1280x1024 BenQ LCD and the second either for my rather crappy 20" 1680x1050 Acer LCD (if I need more space for work) or my Samsung Pocket Imager (for watching movies)...
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