I am pretty tech savvy, but I couldn't quite understand what I read online. Can someone explain: What is Level 2 cache, and what does it do for the computer? I understand it has something to do with RAM, but I'm not quite sure. What is system bus? I have a Macbook with 800mhz, if I upgrade to the 15 MBP with 1066mhz what will the difference be? Thanks to whoever stops by to answer these noob-esq questions.