[vtkusers] What's the most important : CPU or graphic card

[Damien Lecan]

Hello

I'm using vtk to create volume from CT images.
This operation costs a lot of power, and sometimes, rotations are a lit bit
slow.

What should I upgrade in priority ? CPU or graphic card ?
What is the most important when vtkVolume16Reader() is used ?

Computers I use :
 * CPU between Celeron 700 and PIII 800
 * Graphic cards between no name and ATI Xpert 2000
 * Memory : between 128Mo and 256Mo

Thanks a lot.

Damien Lecan