As mentioned here load up the memory when you purchase it , it's a lot cheaper. I have new Mac Pro, love it. I ordered with 4 gig and when I added 4 more later it was a lot more expensive. But I have been able to get rid of two other systems that were running windows xp and fedora linux , now I just us parallels desktop for Mac and run them in a window drag & drop files,etc between the two.