Definitely use the Display Port cable and for your HD5850+U2410.Also curious, which would be the better output for my 5850: displayport or hdmi? __________________
In contrast, DisplayPort is the digital interface for connecting flat-panel displays to computer systems. It will eventually replace VGA, DVI, and LVDS in IT equipment such as home and office PCs, projectors, monitors, and data center consoles. HDMI is not designed to meet these internal and external IT connectivity requirements...it is an external consumer electronics interface.
Definitely use the Display Port cable and for your HD5850+U2410.
Dell