I have the late 2008 white macbook and I'm not happy with the default 'Intel GMA X3100 using 144 MB RAM' graphics card. I was looking at the early and mid 2009 macbook's (I believe these are the unibodies?) and they have the 'nVidia GeForce 9400M using 256 MB RAM' graphics card. I was wondering if I could upgrade my current graphics card to the nVidia GeForce 9400M or maybe something better? If not which graphics card could I upgrade it to, and can I upgrade it at all? I would also like to know if graphics card would be sold in Apple Stores or if I would have to look in ordinary electrical shops. Thanks.