I'm not sure if anyone else has seen this, but apparently some MacBooks can run 8GB of RAM. appleserialnumberinfo.com describes mine as: Model: - MacBook (13-inch, Aluminum, Late 2008) (CTO) Codename: - "M97" Build Country: - Your Mac was built in Changhai, China. Build Year: - Your Mac was built in 2009. Build Week - Your Mac was built in week 2 of that year (January). Production Nr.: - Your Mac was number 1098 to be built that week. My employer purchased 8GB of Lenovo brand memory for my MB and it's running fine. I tried VMWare to test out all 8GB and my system was still stable. Activity Monitor reported 7.5GB of memory used. All the information I could find about my machine specified 6GB as the maximum, but I figured I'd try 8 since I wasn't paying.