That is true for a number of systems. Official support will max out at 3 for instance, but you can install 4, and usually you will get slightly better performance from having matched pairs.Another question. Officially this model only supports 3 GB of RAM but I have been reading people can put 4 in. Guy at the store where I bought the software says you can put in 4 but the Mac will only "see" 3.
You can skip that if you like by just using the Disk Utility and an external USB drive mount like BlackX. Basically the steps are:Since I've only had the computer for a week, it would be hard to say if I am noticing any differences other than my dock is much more crowded than before. I also know I can do the upgrades again if I end up buying a bigger hard drive.