HD Graphic Cards

[hache]

O.k... I'm not so good when it comes to hardware, so forgive me is the following is to much of a dumb question:

What advantages do I have if using and HD video graphic card? What I mainly need to know is if the ONLY way of importing HD video is using a firwire from an HD Graphic Card, but in general I would love to know every single advantage.

THANKS

[aryanaa]

I got black ops a couple months ago and it played ok on no shadows and lowest resolution, but there was still alot of lag. The laptop i was playing it on crashed a couple days ago and it had a crapy graphics card. Which graphics card can run black ops really good that is kinda cheap.