I've got a 2.4GHz Core 2 Duo Macbook Pro (MacBookPro5,1). I think it's the first unibody model. It's currently got 4GB DDR3 Ram in but I want to improve the performance when using Parallels so want to upgrade the Ram. What is the maximum ram this Macbook Pro can take? I tried the Crucial System Scanner and it said maximum was 4GB but wondering if anyone here knows better.