http://www.macfixit.com/article.php?story=20061030234910147 According to the above link, the core duo is a 32 bit chipset/processor. Is the MBP C2D 64 bit? Unlike the Imac, Apple's website doesn't state that it is. I'm just worried that Apple will release OSX that is for 64bit processors "only". With the pace Intel is churning out new and better processors, I'm worried it will be too soon.