typically your video card doesn't "capture" per se...it acts as an I/O device, and then you'd use a program to capture with...
off the top of my head, Plextor has some boxes that take a coax input, and run usb or firewire to your comp...
http://www.plextor.com/english/produ...oduct_dvc.html
i'm sure there are more...hopefully someone with "working knowlege" of these devices can make a few suggestions
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