I just bought the base model Mac Mini yesterday, and I am going to tear it open today to put in a bigger hard drive and more RAM. My question is...since I don't need the entire 4GB of RAM, I am happy with 3GB. The system has one 1GB chip in there already, so can I simply just pop in a second 2GB chip for a total of 3GB? I wasn't sure if they had to be installed in pairs or not. Is there any downside besides obviously the memory not being under Apple's warranty?