> As IV is running OpenGL, the DirecX version should not influence the
graphic
> perfomance of IV.
100% Right, but in saying that, it is a good idea to keep your computer up
to date with all drivers etc. I would assume that Inventor is not the only
program you use.
If you are running Win2k goto Windows Update and make sure you have all the
latest Critcal updates, windows updates & drivers (never get Graphics
drivers from windows update).