I sell Mac computer and just to cool things off
U cannot run Mac OS on just any dual core processor like those on PC
The Duo Core on Mac is solely on partnership with Apple
As for speed, being a Mac user for the last odd 20 yrs, I can safely say my Quad-Core G5 will blow any PC out on the market
As for those who intent to seek out cheaper Macbook Pro, those that are on sale are the older 1.83 which was overstocked by dealers
But it from outside Apple Resellers and u end up with problems later on
I have used the Duo Core and running windows xp is faster than a normal 2.4Pentium running windows
Hope that clear the myth of Apple and Windows
Ideally run Linux on a Mac and u have the best of both world
Cheers