Hello. So obviously one thing about the Mac Pro is you can't upgrade the video cards. I've read about people using something like this http://www.sonnettech.com/product/echoexpress3d.html to add "serious" video cards to Mac laptops, for example to extreme game under Bootcamp. I notice on that page that they have images of the Mac Pro. Would the Mac Pro be able to incorporate external video cards in this way, e.g to game under Windows Bootcamp? Has anyone done this or read anything about it?