Thanks for your replies. Now I know much more than I did 2 days ago .
I have another doubt
I know that Inventor is still mostly a single thread application, so having multiple cores does not help as much as a processor with faster speed.
The question is Are other components of the inventor product design suite ( Alias Design, 3ds Max, AutoCAD Mechanical, Showcase, SketchBook Designer, Mudbox) also single thread or multiple threaded applications and whether we should go for multi core for them, hoping they will still be a part of the suite in the future.
Also I did a little digging on the importance of various components in a system and found following