In article , Tim
wrote:

I'm going to be adding an outboard graphics card to my PC. It has, one
each, a DVI-D, a displayport, and and HDMI port. My two monitors both have
DVI-D ports. I know I will need to get an adapter cable of some sort to
connect the second DVI-D monitor to either one of the other ports. Which
one would be best the displayport or the HDMI?

dvi-hdmi adapters are cheap.

FYI, my second monitor also has a VGA port that is currently how it is
driven.

yuk. switch to dvi.