Tell me what laptops you are looking at. If you want to be fully safe for both softwares go with the Dell M70 as it uses a Quadro Card for the video.
Stay as close to the Nvidia as possable.I do know that X does work to a point with some of the higher ATI cards in say the HP laptops.
I use a HP laptop with a Nvidia chipset for Mastercam and I am the main support for southern Cali mastercam dealer ship.
So I use this for Demos support and trainning.
I also run Solid works on this same box.
Hope this helps
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)
Cadcam
Software and hardware sales, contract Programming and Consultant , Cad-Cam Instructor .