If you're a student, you probably shouldn't worry about it. If you were working with super heavy models in rhino, it would likely require a desktop or workstation. I'm not sure why the use of keyshot and rhino for graphic design. It seems weird to me using a CAD nurbs modeler for your area of study.
Oh no, like I said, I myself only use Lightroom 4, Illustrator, and Photoshop. I have never touched those other apps. I was only asking (since OP does use them), if they required a good GPU, cause I do know that they render 3D graphics and are pretty heavy programs.