Having had this question myself, regarding mobility cards - I figured i'd post the findings I came up with to help others in a similar situation. Below is a list of cards that support the native resolutions of the said monitors.
http://www1.us.dell.com/content/learnmore/learnmore.aspx?c=us&cs=RC956904&l=en&s=hied&~id=monitors&~line=desktops&~mode=popup&~series=optix&~tab=other
http://www1.us.dell.com/content/learnmore/learnmore.aspx?c=us&cs=RC956904&l=en&s=hied&~id=monitors&~line=desktops&~mode=popup&~series=optix&~tab=other