If you could find a cable maybe better than an adaptor - thing is I'm not clear on what is what ?? is the dvi-I on your monitor male or female ??
thing is if female I think a cable that has a dvi-I/d male to plug into the monitor and a dvi-d male to plug into the card is your best bet ??
http://www.newegg.com/Product/Product.aspx?Item=N82E16812189047
this has dvi-d on both ends [dvi-d will plug into dvi-I]