http://www.iiyama.com/support2/faq.html
Q:What is the difference between DVI-I
and DVI-D ,D-Sub connector?
DVI is Digital Visual Interface.
DVI-D : 24 pin connector accept only Digital video input .
DVI-I : 29 pin connector accept Digital or Analog video signal .
When you want to use Digital signal, please use DVI-D to DVI-D cable.
When you want to use Analog signal, please use DVI-I to D-sub cable.
(Impossible to use both signal same time)
En gros, DVI-D = interface uniquement digitale, tandis qu'une interface DVI-I peut aussi être utilisée comme sortie analogique.