So ML is really terrible on on 2GB RAM, should I go 4 or 8? Or 5, but that would be asynchronous and I think that would break dual channel? I'm happy with 4GB in Windows 8 but I'm not sure if ML handles differently (I was surprised how much heavier it feels than Windows). It's the last white macbook (c2d 2.4/320m). If I did get a 4GB stick and went 5GB, would losing dual channel make anything significantly slower? This is for a med student, nothing heavy like programming or graphics work but she does multitask a lot.