hi guys. my colleague just bought a white macbook yesterday. it's the one with a 2.0ghz c2d processor, 2gb ram and 120 gb hd. what surprised me is that it came with an nvidia video card. i was surprised because i thought you can only max out the ram of you mb since you can't install video cards on it. i have also a white mb with 2.4ghz c2d & 2gb ram. is it possible for me to install a video card also on my mb? what do i need to do? thanks guys in advance for your replies.