Seriously! This is the most bizarre thing... I downloaded 10.6.5 this evening for my MP - the download and install went flawlessly. After it was all done and the machine restarted, I clicked on "About this Mac" and that's when I noticed it said "Memory: 11 GB" I was like HUH!!! The machine shipped with 4 x 1GB DIMMS and then I bought 4 x 2GB DIMMS from OWC. When I clicked on "More Info..." and it brought up the System Profiler it says I have still have my 4 x 2GB DIMMS, but now it says I have 2 x 1GB DIMMS and 2 x 512MB DIMMS. What the heck is going on?