HD cards for CPU

You don't connect a CPU (Central processing unit) to a TV. You may connect your computer to a TV, and if thats what your refering to then you need to find out what video outputs your PC has.

I would say its likely that your PC has a DVI connector and that your TV would have a HDMI port, so just grab a DVI to HDMI converter and a HDMI cable and connect the two.