console usage?
so you can use your pc via the vga/dvi connection and a hd source into the hdmi connection.
Basically, your GFX card's connection ports affect what connection on your monitor you will use.
VGA - VGA cable
HDMI - HDMI cable
DVI - DVI cable
Or, if your GFX card has a connection that your monitor does not, i.e. GFX card is DVI but monitor only has HDMI port, you can use a DVI to HDMI adaptor.
use whatever is available to you. There is no difference between HDMI and DVI. HDMI just carries an audio signal, aswell as video.
Really the same but personally, I would always go for HDMI.
I'm running my 8800GT which only has 2 DVI ports via HDMI to my TV using an adaptor.