I own 2 2011 Mac Minis. A little over a year ago, I obtained a 5,2 mac mini with the minimum 4gb of RAM. This mini was running lion. With 4gb of RAM, it ran fine for normal tasks and was quite versatile, however, I did upgrade it to 8gb because I had more demanding tasks to throw at it. Recently, I obtained a 5,1 mini on craigs list for very cheap. It came with 3gb of ghetto aftermarket ram which I promptly replaced with the 5,2's oem 4gb. I was using the mini for a few days and noticed a lot of beach balling during minimal use. In fact, the 5,1 running mountain lion, vlc, flash, firefox and background anti virus was prone to page outs. Has anyone else noticed that the newer model minis effectively need to be running more 8gb of RAM to really function for casual use?