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Possible Duplicate:
DVI-I - Single Link vs Dual Link
How do I know if my Dell Latitude E6420 has dual link DVI? It has a VGA output but the docking station has two DVI outputs?
Is there a VGA to Dual Link DVI adapter?
Is Dual Link DVI a computer spec or a cable feature?
It's a function of the port (and by extension, the video adapter) itself. The only way to be 100% sure is to look up the exact specs on the hardware in question. (Dual-link does have more pins but some single-link ports have the holes for those pins, just not connected to anything, so visual inspection isn't sufficient.) – Shinrai – 2012-01-10T15:36:48.507