HDMI

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High Definition Multimedia Interface

The nearly standard interface on an HDTV, it can pass both digital audio and video and can also incorporate HDCP DRM for protecting content.

In general, there are graphics cards with DVI-D and/or HDMI connectors. Note that if your graphics card only has VGA (i.e. analog) output, there is no way to connect that card via HDMI to a display.

ATI graphics cards

Good support, mostly used DVI-HDMI cable to connect HDTV. Don't forget setup Underscan to remove black borders. Can be set that in /home/mythtv/.xinitrc:

/opt/bin/aticonfig --set-dispattrib=tmds2i,positionX:0
/opt/bin/aticonfig --set-dispattrib=tmds2i,positionY:0
/opt/bin/aticonfig --set-dispattrib=tmds2i,sizeX:1920
/opt/bin/aticonfig --set-dispattrib=tmds2i,sizeY:1080

nVidia graphics cards

DVI-D

There are many graphics cards that have one or two DVI-D connectors, e.g. the Asus EN9800GT TOP/HTDP. With a DVI-D-to-HDMI-adapter(-cable), you can connect those cards to the HDMI input of your LCD TV.

The Asus EN9800GT TOP/HTDP graphics card doesn't have any support for HDMI audio or for patching the SP/DIF output of e.g. the mainboard through to the HDMI cable.