If u are talking about graphic card, i tink when they put dual
DVI, HDMI, it mean 2 dvi outputs, 1 HDMI output. in the box, there
would be converters from dvi to vga, or dvi to hdmi.
They are called dongles
my ATI radeon HD3870x2 comes with 3 dvi, 1 HDMI, 1 S-video
output on board, and on the box they say:"triple DVI, HDMI"
And HDMI comes with cable, if u ar talking about the nvidia
graphics card, i heard that the HDMI dongle does not support audio,
and the ati HD series ones support audio out of the HDMI, 1080p
most ATi Radeon HD cards come with HDMI as the GPU has got the
codec of HD audio integrated, thus audio from the sound card can
output to the GPU through PCI-E and to the HDMI port...
for Nvidia cards, u'll need to connect the graphic card and
sound card by S/PDIF cable in order to output as HDMI... anyway,
all Nvidia cards are designed to output sound through DVI as well,
but this doesn't make sense as all DVI cables do not carry sound,
thus they require a special dongle/converter in order to output
both sound and video thru HDMI...
however, it seems that ATi is also adopting this approach (less
the S/PDIF part) lately with the launch of Radeon HD 4850 (ie needs
a dongle to connect thru HDMI), which is not surprising to me since
for every HDMI port created, they'll ve to pay royalty fee...