I recently started using mac osx, and I was wondering if Leopard, with its 64bit capabilities, makes use of huge amounts of ram- like 32gb in the mac pros. I have a macbook pro and am considering upgrading to 4gb, but I wanted to know how Leopard deals with extra memory. doe sit load more of itself in to memory? Will more memory make coverflow work faster? If Leopard has a huge amount of memory to work with- 32gb for example, will it fundamentally change the way it operates relating to the hard disk or does it only use what is needed by applications as they open?