Gaming and CAD don't really mix. The cards for gaming are optimized for performance while the ones optimized for CAD are designed to be accurate (less aliasing).
I would say to look at the Dell Precision or Lenovo W series :Dell mobile Precision websiteLenovo Thinkpad W series website
I haven't used the HP Elitebook workstations but you can have a look at them:HP Elitebook
You didn't specify if you were doing 2D or 3D CAD. 3D CAD heavily prefers a Quadro or Firepro/FireGL card while 2D doesn't require much (NVS is for 2D applications, so it isn't very good for gaming).