External Graphics Card for Notebooks

Hi All,

I wanted to know about the external graphics card available for laptops/notebooks.

I read another thread here which tells about XG station from ASUS. Also I got some info on ATI's external graphics card called R600.

Also I heard that external graphics card are not fast enough to support the latest power hungry games.

Hence I need some guidance in this regard.

I apologise if I posted this in the wrong forum.

Thanks
Sudhir