I'm getting a MacBook when they hit the stores, and I was wondering if adding a 1gb stick to the standard 512 would be a good idea? I know that more RAM is good, but I have a feeling doing so would make it so that it wasn't running in Dual Channel mode, if such a thing exists on these guys. I'll probably end up putting 2 1gb sticks in there anyway, but I wanted to know how much performance I'd lose by running it with 1.5 for a while before going all in.